Undercounter Ice Machines Technicians andoo

Part Number 000014797 Rev03 03/21

Undercounter Ice Machines

Technician’s HandbookThis manual is updated as new information and models are released. Visit our website for the latest manual. www.manitowocice.com

Engineered For ease

Safety NoticesRead these precautions to prevent personal injury:

• Read this manual thoroughly before operating, installing or performing maintenance on the equipment. Failure to follow instructions in this manual can cause property damage, injury or death.

• Routine adjustments and maintenance procedures outlined in this manual are not covered by the warranty.

• Proper installation, care and maintenance are essential for maximum performance and trouble-free operation of your equipment.

• Visit our website www.manitowocice.com for manual updates, translations, or contact information for service agents in your area.

• This equipment contains high voltage electricity and refrigerant charge. Installation and repairs are to be performed by properly trained technicians aware of the dangers of dealing with high voltage electricity and refrigerant under pressure. The technician must also be certified in proper refrigerant handling and servicing procedures. All lockout and tag out procedures must be followed when working on this equipment.

• This equipment is intended for indoor use only. Do not install or operate this equipment in outdoor areas.

• As you work on this equipment, be sure to pay close attention to the safety notices in this handbook. Disregarding the notices may lead to serious injury and/or damage to the equipment.

nWarningFollow these electrical requirements during installation of this equipment.

• All field wiring must conform to all applicable codes of the authority having jurisdiction. It is the responsibility of the end user to provide the disconnect means to satisfy local codes. Refer to rating plate for proper voltage.

• This appliance must be grounded.

• This equipment must be positioned so that the plug is accessible unless other means for disconnection from the power supply (e.g., circuit breaker or disconnect switch) is provided.

• Check all wiring connections, including factory terminals, before operation. Connections can become loose during shipment and installation.

• For a cord-connected appliance, the following must be included:

• Do not unplug by pulling on cord. To unplug, grasp the plug, not the cord.

• Unplug from outlet when not in use and before servicing or cleaning.

• Do not operate any appliance with a damaged cord or plug, or after the appliance malfunctions or is dropped or damaged in any manner. Contact the nearest authorized service facility for examination, repair, or electrical or mechanical adjustment

nWarningFollow these precautions to prevent personal injury during installation of this equipment:

• Installation must comply with all applicable equipment fire and health codes with the authority having jurisdiction.

• To avoid instability the installation area must be capable of supporting the combined weight of the equipment and product. Additionally the equipment must be level side to side and front to back.

• Remove front panel before lifting and installing and use appropriate safety equipment during installation and servicing. Two or more people are required to lift or move this appliance to prevent tipping and/or injury.

• Do not damage the refrigeration circuit when installing, maintaining or servicing the unit.

• Connect to a potable water supply only.

• This equipment contains refrigerant charge.

nWarningFollow these precautions to prevent personal injury while operating or maintaining this equipment.

• Legs or casters must be installed and the legs/casters must be screwed in completely. When casters are installed the mass of this unit will allow it to move uncontrolled on an inclined surface. These units must be tethered/secured to comply with all applicable codes. Swivel casters must be mounted on the front and rigid casters must be mounted on the rear. Lock the front casters after installation is complete.

• Some 50 Hz models may contain up to 150 grams of R290 (propane) refrigerant. R290 (propane) is flammable in concentrations of air between approximately 2.1% and 9.5% by volume (LEL lower explosion limit and UEL upper explosion limit). An ignition source at a temperature higher than 470°C is needed for a combustion to occur.

• Refer to nameplate to identify the type of refrigerant in your equipment.

• Only trained and qualified personnel aware of the dangers are allowed to work on the equipment.

• Read this manual thoroughly before operating, installing or performing maintenance on the equipment. Failure to follow instructions in this manual can cause property damage, injury or death.

• Crush/Pinch Hazard. Keep hands clear of moving components. Components can move without warning unless power is disconnected and all potential energy is removed.

• Moisture collecting on the floor will create a slippery surface. Clean up any water on the floor immediately to prevent a slip hazard.

nWarningFollow these precautions to prevent personal injury while operating or maintaining this equipment.

• Objects placed or dropped in the bin can affect human health and safety. Locate and remove any objects immediately.

• Never use sharp objects or tools to remove ice or frost.

• Do not use mechanical devices or other means to accelerate the defrosting process.

• When using cleaning fluids or chemicals, rubber gloves and eye protection (and/or face shield) must be worn.

DANGERDo not operate equipment that has been misused, abused, neglected, damaged, or altered/modified from that of original manufactured specifications. This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision concerning use of the appliance by a person responsible for their safety. Do not allow children to play with, clean or maintain this appliance without proper supervision.

DANGER

Follow these precautions to prevent personal injury during use and maintenance of this equipment:

• It is the responsibility of the equipment owner to perform a Personal Protective Equipment Hazard Assessment to ensure adequate protection during maintenance procedures.

• Do Not Store Or Use Gasoline Or Other Flammable Vapors Or Liquids In The Vicinity Of This Or Any Other

• Appliance. Never use flammable oil soaked cloths or combustible cleaning solutions for cleaning.

• All covers and access panels must be in place and properly secured when operating this equipment.

• Risk of fire/shock. All minimum clearances must be maintained. Do not obstruct vents or openings.

• Failure to disconnect power at the main power supply disconnect could result in serious injury or death. The power switch DOES NOT disconnect all incoming power.

• All utility connections and fixtures must be maintained in accordance with the authority having jurisdiction.

• Turn off and lockout all utilities (gas, electric, water) according to approved practices during maintenance or servicing.

• Units with two power cords must be plugged into individual branch circuits. During movement, cleaning or repair it is necessary to unplug both power cords.

We reserve the right to make product improvements at any time. Specifications and design are subject to change without notice.

Table of Contents

Part Number 000014797 Rev03 03/21 9

General InformationModel Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17How to Read a Model Number . . . . . . . . . . . . . . . . 19Model/Serial Number Location . . . . . . . . . . . . . . . 19Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Warranty Registration . . . . . . . . . . . . . . . . . . . . . 20

InstallationLocation of Ice Machine . . . . . . . . . . . . . . . . . . . . . . . 21Ice Machine Clearance Requirements . . . . . . . . . 22Ice Machine Heat of Rejection . . . . . . . . . . . . . . . . 22Leveling the Ice Machine . . . . . . . . . . . . . . . . . . . . . . 23Electrical Requirements . . . . . . . . . . . . . . . . . . . . . . . 24Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . 24Water Service/Drains . . . . . . . . . . . . . . . . . . . . . . . . . 26

Water Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Cooling Tower Applications . . . . . . . . . . . . . . . . 27

MaintenanceDetailed Descaling and Sanitizing Procedure U0140, UF0140, U0190, UF0190, U0240, UF0240, U0310, UF0310 . . . . . . . . . . . . . . . . . . . . . . 29

Remedial Cleaning . . . . . . . . . . . . . . . . . . . . . . . . 39Cleaning the Condenser . . . . . . . . . . . . . . . . . . . 41Removal from Service/Winterization . . . . . . . 42Bin Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Detailed Descaling and Sanitizing Procedure UDE0065 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Cleaning The Condenser . . . . . . . . . . . . . . . . . . . 50Removal from Service/Winterization . . . . . . . 51

Detailed Descaling and Sanitizing Procedure UDE0080 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Cleaning The Condenser . . . . . . . . . . . . . . . . . . . 63Removal from Service/Winterization . . . . . . . 64

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OperationSequence of Operation U0140/UF0140/U0190/UF0190/UF0240/U0240/U0310/UF0310 . . . . . . 65

Touch Pad Features . . . . . . . . . . . . . . . . . . . . . . . . 65Ice Making Sequence of Operation . . . . . . . . . . . 68

Control board Revisions . . . . . . . . . . . . . . . . . . . 68Software revisions . . . . . . . . . . . . . . . . . . . . . . . . . 68Sequence of Operation . . . . . . . . . . . . . . . . . . . . 69Control Board Timers . . . . . . . . . . . . . . . . . . . . . . 71Safety Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72U0140/UF0140/U0190/UF0190/U0240/UF0240/U0310/UF0310 Energized Parts Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Operational Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . 76Ice Thickness Check . . . . . . . . . . . . . . . . . . . . . . . 76Ice Thickness Adjustment . . . . . . . . . . . . . . . . . . 76Minimum/Maximum Slab weight . . . . . . . . . . 77

Sequence of Operation UDE0065 . . . . . . . . . . . . . 78UDE0065 Energized Parts Chart . . . . . . . . . . . . 80Ice Thickness Adjustment . . . . . . . . . . . . . . . . . . 81

Sequence of Operation UDE0080 . . . . . . . . . . . . . 82UDE0080 Energized Parts Chart . . . . . . . . . . . . 84

Operational Checks UDE0080 . . . . . . . . . . . . . . . . . 86Siphon System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86Water Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86Water Level Check . . . . . . . . . . . . . . . . . . . . . . . . . 87Ice Thickness Check . . . . . . . . . . . . . . . . . . . . . . . 88

Part Number 000014797 Rev03 03/21 11

TroubleshootingTroubleshooting U0140/UF0140/U0190/UF0190/U0240/UF0240/U0310/UF0310 . . . . . . 89

Problem Checklist . . . . . . . . . . . . . . . . . . . . . . . . . 89Control Board Test Mode . . . . . . . . . . . . . . . . . . 92Operating Ice Machine with Bin and Touch Pad Removed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92Diagnosing an Ice Machine that Will Not Run . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93Ice Machine Does Not Cycle Into Harvest when the Harvest Float is down/closed . . . . . . . . . . . 94Ice Machine Cycles Into Harvest Before the Harvest Float is down/closed . . . . . . . . . . . . . . 96Ice Production Check . . . . . . . . . . . . . . . . . . . . . . 98Installation/Visual Inspection Checklist . . . . 100Water System Checklist . . . . . . . . . . . . . . . . . . . 100Ice Formation Pattern . . . . . . . . . . . . . . . . . . . . . 102Safety Limit Feature . . . . . . . . . . . . . . . . . . . . . . 104Analyzing Discharge Pressure . . . . . . . . . . . . 111Analyzing Suction Pressure . . . . . . . . . . . . . . . 113Harvest Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117Comparing Evaporator Inlet/Outlet Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121Discharge Line Temperature Analysis . . . . . . 122Refrigeration Component Diagnostics . . . . 124Refrigeration Analysis Chart . . . . . . . . . . . . . . 126

Troubleshooting UDE0065 . . . . . . . . . . . . . . . . . . . 130Diagnosing an ice machine that will not run . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130Refrigeration Diagnostics Overview UDE0065 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131Ice Production Check . . . . . . . . . . . . . . . . . . . . . 134Installation/Visual Inspection Checklist . . . . 136Water System Checklist . . . . . . . . . . . . . . . . . . . 137

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UDE0065 Refrigeration Diagnostics . . . . . . . . . 139Flooding Expansion Valve Symptoms . . . . . 140Starving Expansion Valve/Low Refrigerant Charge Symptoms: . . . . . . . . . . . . . . . . . . . . . . . 140Overcharged System Symptoms . . . . . . . . . . 140Analyzing Ice Formation Pattern . . . . . . . . . . 141Analyzing Discharge Line Temperature . . . 143Analyzing Suction Line Temperature . . . . . . 145Comparing Evaporator Inlet/Outlet Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148Discharge Line Temperature Analysis . . . . . . 149Harvest Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

Troubleshooting UDE0080 . . . . . . . . . . . . . . . . . . . 155Diagnosing An Ice Machine That Will Not Run . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155Safety Limit Feature . . . . . . . . . . . . . . . . . . . . . . 156Diagnosing Ice Thickness Control Circuitry 161Ice Production Check . . . . . . . . . . . . . . . . . . . . . 163Installation/Visual Inspection Checklist . . . . 165Water System Checklist . . . . . . . . . . . . . . . . . . . 166

UDE0080 Refrigeration Diagnostics . . . . . . . . . 168Flooding Expansion Valve Symptoms . . . . . 169Starving Expansion Valve/Low Refrigerant Charge Symptoms: . . . . . . . . . . . . . . . . . . . . . . . 169Overcharged System Symptoms . . . . . . . . . . 169Analyzing Ice Formation Pattern . . . . . . . . . . 170Analyzing Discharge Line Temperature . . . 172Analyzing Suction Line Temperature . . . . . . 174Comparing Evaporator Inlet/Outlet Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177Discharge Line Temperature Analysis . . . . . . 178Harvest Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180

Part Number 000014797 Rev03 03/21 13

Component Check ProceduresMain Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185Bin Switch UDE0080/U0140/UF0140/U0190/UF0190/U0240/UF0240/U0310/UF0310 . . . . . . . . . . . 186Touch Pad U0140/UF0140/U0190/UF0190/U0240/UF0240/U0310/UF0310 . . . . . . . . . . . . . . . . . . . 188Float Switch U0140/UF0140/U0190/UF0190/UF0240/U0240/U0310/UF0310 . . . . . . . . . . . . . . . . . . . . 190Water Trough Thermistor U0140/UF0140/U0190/UF0190/U0240/UF0240/U0310/UF0310 . . . . . . . . . . . . . . . . . . . 192Bin Thermostat UDE0065 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194Liquid Line Thermistor UDE0065 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195ON/OFF/WASH Toggle Switch UDE0065/UDE0080 . . . . . . . . . . . . . . . . . . . . . . . 197Compressor Electrical Diagnostics . . . . . . . . 198Fan Cycle Control UDE0080/U0140/UF0140/U0190/UF0190/U0240/UF0240/U0310/UF0310 . . . . . . . . . . . 200High Pressure Cutout (HPCO) Control UDE0080 U0140/UF0140/U0190/UF0190/U0240/UF0240/U0310/UF0310 . . . . . . . . . . . 201

14 Part Number 000014797 Rev03 03/21

Filter-Driers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202Refrigerant Recovery/Evacuation . . . . . . . . . . . . 203

Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203Refrigerant Re-use Policy . . . . . . . . . . . . . . . . . 204Recovery and Recharging Procedures U0140/UF0140/U0190/UF0190/U0240/UF0240/U0310/UF0310 . . . . . . . . . . . . . . . . . . . 206Recovery and Recharging Procedures UDE0065/UDE0080 . . . . . . . . . . . . . . . . . . . . . . . 209

System Contamination Cleanup . . . . . . . . . . . . . 212Determining Severity of Contamination . . . 212Mild System Contamination Cleanup Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214Severe System Contamination Cleanup Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215Replacing Pressure Controls without Removing Refrigerant Charge . . . . . . . . . . . . . 217

Total System Refrigerant Charge . . . . . . . . . . . . . 218

Part Number 000014797 Rev03 03/21 15

ChartsCycle Times, 24 Hr. Ice Production and Refrigerant Pressure Charts . . . . . . . . . . . . . . . . . . 219

UDE0065 Operating Temperatures . . . . . . . . 220UDE0080 Self-contained Air-cooled . . . . . . . 222UDE0080 Operating Temperatures . . . . . . . . 223U0140/UF0140 Self-contained Air-cooled . 224U0140/UF0140 Self-contained Water-cooled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225U0190/UF0190 Self-contained Air-cooled . 226U0240/UF0240 Self-contained Air-cooled . 227U0240/UF0240 Self-contained Water-cooled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228U0310/UF0310 Self-contained Air-cooled . 229U0310/UF0310 Self-contained Water-cooled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230

16 Part Number 000014797 Rev03 03/21

DiagramsWiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231

UDE0065 Wiring Diagram . . . . . . . . . . . . . . . . . 232UDE0080 Wiring Diagram . . . . . . . . . . . . . . . . . 234U0140/U0190/U0240 Wiring Diagram With J4 Thermistor Terminal - 1Ph Air/Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236U0140/U0190/U0240 Wiring Diagram Prior to Thermistor Terminal - 1PH Air/Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238U0310 Wiring Diagram With J4 Thermistor Terminal - 1Ph Air/Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240U0310 Wiring Diagram Prior To Thermistor Terminal - 1PH Air/Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242

Electronic Control Boards . . . . . . . . . . . . . . . . . . . . 244Electronic Control Board UF Models . . . . . . 244Electronic Control Board U Models with J4 Thermistor Terminal . . . . . . . . . . . . . . . . . . . . . . 246Electronic Control Board U Models Prior to Thermistor Terminal . . . . . . . . . . . . . . . . . . . . . . 248Electronic Control Board UDE0065 . . . . . . . . 250Electronic Control Board UDE0080 . . . . . . . . 252

Tubing Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . 254Tubing Schematic - UDE0065 . . . . . . . . . . . . . 254Tubing Schematic - UDE0080/U0140/UF0140 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255Tubing Schematic - U0190/UF0190/U0240/UF0240/U0310/UF0310 . . . . . . . . . . . . . . . . . . . 255

Part Number 000014797 Rev03 03/21 17

Model NumbersThis manual covers the following models:

Self-contained Air-cooled

Self-contained Water-cooled

UDE0065A –UDE0080A –UDF0140A –UYF0140A –URF0140A –UYP0140A –UDF0190A –UYF0190A –UDF0240A UDF0240WUYF0240A UYF0240WUDF0310A UDF0310WUYF0310A UYF0310WURF0310A URF0310W

Self-contained

Air-cooledSelf-contained Water-cooled

UDE0065A –UDE0080A –

General Information

18 Part Number 000014797 Rev03 03/21

Self-contained Air-cooled

Self-contained Water-cooled

UD0140A UD0140WUD0140AE UD0140WEUY0140A UY0140W

UY0140AE UY0140WEUR0140A –

UR0140AE –UD0190A –

UD0190AE –UY0190A –

UY0190AE –UR0190A –

UR0190AE –UD0240A UD0240W

UD0240AE UD0240WEUY0240A UY0240W


UR0240AE –UD0310A UD0310W

UD0310AE UD0310WEUY0310A UY0310W


UR0310AE –

Part Number 000014797 Rev03 03/21 19

How to Read a Model Number

U D F 0140 A E

Cube Size

Series

Capacity

Condenser Type

E - WRAS 50Hz

A - Air-cooledW - Water-cooled

R - RegularD - Dice

Y - Half-dice

nWarningAn ice machine contains high voltage electricity and refrigerant charge. Repairs are to be performed by properly trained refrigeration technicians aware of the dangers of dealing with high voltage electricity and refrigerant under pressure.

Model/Serial Number LocationThese numbers are required when requesting information from your local Manitowoc Distributor, Service Representative, or Manitowoc Ice.

The model/serial number data plate is located in the evaporator compartment and on the back of the ice machine.

Refrigerant E - R134A F - R404a P - R290

Blank - Not Indicated

20 Part Number 000014797 Rev03 03/21

WarrantyFor warranty information visit:

www.manitowocice.com/Service/Warranty

• Warranty Coverage Information

• Warranty Registration

• Warranty Verification

Warranty coverage begins the day the ice machine is installed.

WARRANTY REGISTRATIONCompleting the warranty registration process is a quick and easy way to protect your investment. Scan the QR code with your smart device or enter the link in a web browser to complete your warranty registration.

WWW.MANITOWOCICE.COM/SERVICE/WARRANTY#WARRANTY-REGISTRATION

Registering your product insures warranty coverage and streamlines the process if any warranty work is required.

Part Number 000014797 Rev03 03/21 21

Location of Ice MachineThe location selected for the ice machine must meet the following criteria. If any of these criteria are not met, select another location.

• The location must be indoors.

• The location must be free of airborne and other contaminants.

• Air temperature: Must be at least 50°F (10°C) but must not exceed 113°F (43.4°C).

• UDE0065 & UDE0080: Must be at least 40°F (4°C) but must not exceed 110°F (45°C)

• The location must not be near heat-generating equipment or in direct sunlight.

• The location must be capable of supporting the weight of the ice machine and a full bin of ice.

• The location must allow enough clearance for water, drain, and electrical connections in the rear of the ice machine.

• The location must not obstruct airflow through or around the ice machine (condenser airflow is in and out the front). Refer to the chart below for clearance requirements.

• The ice machine must be protected if it will be subjected to temperatures below 32°F (0°C). Failure caused by exposure to freezing temperatures is not covered by the warranty.

Installation

22 Part Number 000014797 Rev03 03/21

Ice Machine Clearance RequirementsSelf-contained

Air-cooledSelf-contained Water-cooled

Top/Sides 5" (127 mm)* 5" (127 mm)*Back 5" (127 mm)* 5" (127 mm)*

*The ice machine may be built into a cabinet.

Ice Machine Heat of RejectionSeries

Ice MachineHeat of Rejection*

Air Conditioning** PeakUDE0065 1600 2350UDE0080 1750 2600

U0140/UF0140 2400 2900U0190/UF0190 2200 2600U0240/UF0240 2800 3300U0310/UF0310 3800 6000

* B.T.U./Hour

** Because the heat of rejection varies during the ice making cycle, the figure shown is an average.

Ice machines, like other refrigeration equipment, reject heat through the condenser. It is helpful to know the amount of heat rejected by the ice machine when sizing air conditioning equipment where self-contained air-cooled ice machines are installed.

Part Number 000014797 Rev03 03/21 23

Leveling the Ice Machine1. Screw the legs onto the bottom of the ice machine.

2. Screw the foot of each leg in as far as possible.

,CautionThe legs must be screwed in tightly to prevent them from bending.

3. Move the ice machine into its final position.

4. Level the ice machine to ensure that the drain system functions correctly. Use a level on top of the ice machine. Turn each foot as necessary to level the ice machine from front to back and side to side.

24 Part Number 000014797 Rev03 03/21

Electrical RequirementsVoltage

The maximum allowable voltage variation is ±10% of the rated voltage on the ice machine model/serial number plate at start-up (when the electrical load is highest).

Fuse/Circuit Breaker

A separate fuse/circuit breaker must be provided for each ice machine.

Total Circuit Ampacity

The total circuit ampacity is used to help select the wire size of the electrical supply.

The wire size (or gauge) is also dependent upon location, materials used, length of run, etc., so it must be determined by a qualified electrician.

Electrical SpecificationsAir-cooled Ice Machine

Ice Machine Voltage Phase Cycle

Max. Fuse/Circuit Breaker Total Amps

UDE0065 115/1/60 15 5.3230/1/50 15 5.3

UDE0080 115/1/60 15 6.2230/1/50 15 6.2

U0140UF0140

115/1/60 15 5.0208-230/1/60 15 2.5

230/1/50 15 2.5

U0190/UF0190115/1/60 15 6.0

208-230/1/60 15 3.0230/1/50 15 2.5

U0240UF0240

115/1/60 15 7.0208-230/1/60 15 3.5

230/1/50 15 4.0

U0310UF0310

115/1/60 15 10.0208-230/1/60 15 4.5

230/1/50 15 4.5NOTE: Model/serial plate information overrides all data listed in this chart.

Part Number 000014797 Rev03 03/21 25

Water-cooled Ice Machine

Ice Machine Voltage Phase Cycle

Max. Fuse/Circuit Breaker Total Amps

U0240UF0240

115/1/60 15 7.0208-230/1/60 15 4.0

230/1/50 15 4.0

U0310UF0310

115/1/60 15 10.0208-230/1/60 15 4.5

230/1/50 15 4.5NOTE: Model/serial plate information overrides all data listed in this chart.

nWarningAll wiring must conform to local, state and national codes.

nWarningThe ice machine must be grounded in accordance with national and local electrical code.

26 Part Number 000014797 Rev03 03/21

Water Service/Drains

WATER SUPPLYLocal water conditions may require treatment of the water to inhibit scale formation, filter sediment, and remove chlorine odor and taste.

Important�If you are installing a Manitowoc water filter system, refer to the Installation Instructions supplied with the filter system for ice making water inlet connections.

nWarningFor ice making, connect to a potable water supply only.

Water Inlet Lines

Follow these guidelines to install water inlet lines:

• Do not connect the ice machine to a hot water supply. Be sure all hot water restrictors installed for other equipment are working. (Check valves on sink faucets, dishwashers, etc.)

• If water pressure exceeds the maximum recommended pressure, 80 psig (5.5 bar) obtain a water pressure regulator from your Manitowoc distributor.

• Install a water shut-off valve for ice making potable water.

• Insulate water inlet lines to prevent condensation.

Part Number 000014797 Rev03 03/21 27

Drain Connections

Follow these guidelines when installing drain lines to prevent drain water from flowing back into the ice machine and storage bin:

• Drain lines must have a 1.5-inch drop per 5 feet of run (2.5 cm per meter), and must not create traps.

• The floor drain must be large enough to accommodate drainage from all drains.

• Install a tee to vent the ice machine drain to the atmosphere.

• Insulate drain lines to prevent condensation.

COOLING TOWER APPLICATIONS

Water Cooled Models Only

A water-cooling tower installation does not require modification of the ice machine. The water regulator valve for the condenser continues to control the refrigeration discharge pressure.

It is necessary to know the amount of heat rejected, and the pressure drop through the condenser and water valves (inlet to outlet) when using a cooling tower on an ice machine.

• Water entering the condenser must not exceed 90°F (32.2°C).

• Water flow through the condenser must not exceed 5 gallons (19 liters) per minute.

• Allow for a pressure drop of 7 psig (.48 bar) between the condenser water inlet and the outlet of the ice machine.

• Water exiting the condenser must not exceed 110°F (43.3°C).

,CautionPlumbing must conform to state and local codes.

28 Part Number 000014797 Rev03 03/21

Water Supply and Drain Line Sizing/Connections Lo

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20 p

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80 p

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Part Number 000014797 Rev03 03/21 29

Interior Cleaning and Sanitizing

GeneralDescale and sanitize the ice machine every six months for efficient operation. If the ice machine requires more frequent descaling and sanitizing, consult a qualified service company to test the water quality and recommend appropriate water treatment.

The ice machine must be taken apart for descaling and sanitizing.

,CautionUse only Manitowoc approved Ice Machine Cleaner/Descaler (9405463) and Sanitizer (9405653). It is a violation of Federal law to use these solutions in a manner inconsistent with their labeling. Read and understand all labels printed on bottles before use.

Detailed Descaling and Sanitizing Procedure U0140, UF0140, U0190, UF0190, U0240, UF0240, U0310, UF0310Ice machine cleaner/descaler is used to remove lime scale and mineral deposits. Ice machine sanitizer disinfects and removes algae and slime.

NOTE: U0140/UF0140/U0190/UF0190/U0240/UF0240 U0310/UF0310 start on the following page UDE0065 starts on page 44 UDE0080 starts on page 52

Maintenance

30 Part Number 000014797 Rev03 03/21

Touch Pad OperationPressing and holding the clean button for 3 seconds starts the cycle. The Clean & On/Off lights energize indicating the cycle has started and ice making will automatically start when the cycle is complete.

• Setting the ice machine to stop after the cycle: Press the On/Off button. The On/Off light will de-energize indicating the ice machine will stop after the cycle.

• Pausing the cycle: Press the Clean button. The clean light will flash indicating the cycle has paused. Pressing the Clean button again will restart the cycle.

Step 1 Press the On/Off button after ice falls from the evaporator at the end of a Harvest cycle. Or, press the On/Off button and allow the ice to melt off the evaporator.

,CautionNever use anything to force ice from the evaporator. Damage may result.

Step 2 Remove all ice from the bin.

nWarningWear rubber gloves and safety goggles (and/or face shield) when handling Ice Machine Cleaner/Descaler or Sanitizer.

Part Number 000014797 Rev03 03/21 31

,CautionDo not mix Ice Machine Cleaner/Descaler and Sanitizer solutions together. It is a violation of Federal law to use these solutions in a manner inconsistent with their labeling.

Step 3 To start a descaling cycle, select Clean. Water will flow through the water dump valve and down the drain. Wait until the water trough refills, then add the proper amount of ice machine cleaner/descaler to the water trough.

Model Amount of Cleaner/Descaler Part Number 9405463

U0140/UF0140 2 ounces (60 ml)U0190/UF0190 5 ounces (150 ml)U0240/UF0240 5 ounces (150 ml)U0310/UF0310 5 ounces (150 ml)

Wait until the cycle is complete (approximately 22 minutes) then press the On/Off button and disconnect power and water supplies to the ice machine.

Step 4 Remove parts for descaling. Refer to the proper parts removal for your machine. Continue with step 5 when the parts have been removed.

32 Part Number 000014797 Rev03 03/21

Step 5 Mix a solution of cleaner/descaler and warm water. Depending on the amount of mineral buildup, a larger quantity of solution may be required. Use the ratio in the table below to mix enough solution to thoroughly descale all parts.

Solution Type Water Mixed withCleaner/Descaler 1 gal. (4 l) 16 oz (500 ml)

cleaner/descalerpart number 9405463

,CautionDo not immerse electrical connectors or motors for any components in water, cleaner/descaler or sanitizer solutions.

Use half of the cleaner/descaler and water solution to descale all components. The solution will foam when it contacts lime scale and mineral deposits; once the foaming stops use a soft bristle brush, sponge or cloth (not a wire brush) to carefully descale the parts. Soak the parts for 5 minutes (15 – 20 minutes for heavily scaled parts). Rinse all components with clean water.

Step 6 While components are soaking, use half of the cleaner/descaler and water solution to descale all foodzone surfaces of the ice machine and bin. Use a nylon brush or cloth to thoroughly descale the following ice machine areas:

• Evaporator plastic parts – including top, bottom and sides

• Bin bottom, sides and top

• Rinse all areas thoroughly with clean water.

Part Number 000014797 Rev03 03/21 33

Step 7 Mix a solution of sanitizer and warm water.

Solution Type Water Mixed WithSanitizer 3 gal. (12 l) 2 oz (60 ml) sanitizer

part number 9405653

Use half of the sanitizer/water solution to sanitize all removed components. Use a spray bottle to liberally apply the solution to all surfaces of the removed parts or soak the removed parts in the sanitizer/water solution. Do not rinse parts after sanitizing.

Step 8 Use half of the sanitizer/water solution to sanitize all foodzone surfaces of the ice machine and bin. Use a spray bottle to liberally apply the solution. When sanitizing, pay particular attention to the following areas:

• Evaporator plastic parts - including top, bottom and sides


Do not rinse the sanitized areas.

Step 9 Replace all removed components, wait 10 minutes, then reapply power and water to the ice machine

Step 10 Select Clean. Water will flow through the water dump valve and down the drain. Wait until the water trough refills, then add the proper amount of ice machine sanitizer to the water trough.

Model Amount of Sanitizer Part Number 9405653

U0140/UF0140 1 ounces (30 ml)U0190/UF0190 2 ounces (60 ml)U0240/UF0240 2 ounces (60 ml)U0310/UF0310 2 ounces (60 ml)

Wait until the sanitize cycle is complete (approximately 22 minutes) then press the Ice button to start ice making.

34 Part Number 000014797 Rev03 03/21

Remove Parts for Descaling

nWarningDisconnect electric power to the ice machine at the electric switch box before proceeding.

1. Remove the Harvest Float Switch and Ice Thickness Float Switch

• Pull forward on the bottom of the bracket until clear of the tab, then slide bracket upward to remove the bracket and float as an assembly. At this point, the float switches can easily be descaled. If complete removal is desired, follow the wires to the bulkhead grommet (exit point) in the back wall. Pull the wire connector through the bulkhead grommet, then disconnect the wire leads from the connector.

NOTE: The wire from the top grommet goes to the ice thickness float switch (front switch). The wire from the bottom grommet goes to the Harvest float switch (side switch).

Important

Reversing the mounting location of the ice thickness and the harvest floats will result in a safety limit 2 failure.

• Do not disassemble float for descaling - Incorrect reassembly will result in an ice machine that will not harvest.

• The ice thickness float must be mounted to the front of the water trough and the electrical connection must be in the top bulkhead grommet.

• The harvest float must be mounted to the side of the water trough and the electrical connection must be in the bottom bulkhead grommet.

• The wire connectors for each float are different and will not allow incorrect electrical bulkhead connection.

Part Number 000014797 Rev03 03/21 35

WIRE CONNECTORS ARE LOCATED BEHIND BULKHEAD PULL THROUGH GROMMET TO DISCONNECT

Harvest FLOAT SWITCH & BRACKET

ICE THICKNESS FLOAT SWITCH & BRACKET

DISCONNECT WIRES FOR COMPLETE

REMOVAL

,CautionDo not disassemble float for descaling - Incorrect reassembly will result in an ice machine that will not harvest.

36 Part Number 000014797 Rev03 03/21

2. Remove the Water Trough Thermistor and Water Trough

• Remove the upper thumbscrew.

• While supporting the water trough remove the thumbscrew and thermistor.

• While supporting the water trough remove the lower thumbscrew from beneath the water trough.

• Remove the water trough from the bin area.

UPPER THUMBSCREW LOWER THUMBSCREW

Part Number 000014797 Rev03 03/21 37

3. Remove the Ice Damper

• Remove thumbscrew from bin switch cover.

• Support ice damper and then pull bin switch cover and ice damper forward to remove.

1. REMOVE THUMBSCREW

2. SUPPORT ICE DAMPER THENSLIDE RIGHT SIDE FORWARD TO REMOVE

38 Part Number 000014797 Rev03 03/21

4. Remove the Water Distribution Tube

• Distribution tube thumbscrews are retained to prevent loss. Loosen thumbscrews but do not pull thumbscrews out of distribution tube.

• Loosen the two outer screws and pull forward on the distribution tube to release.

NOTE: For ease of assembly when reinstalling the water distribution tube, install the top edge first.

1. Loosen Thumbscrews 2. PULL DISTRIBUTION TUBE

FORWARD TO REMOVE

Part Number 000014797 Rev03 03/21 39

REMEDIAL CLEANINGThis procedure can be performed between the bi-annual detailed descaling and sanitizing cycles. This procedure does not require removing the ice from the bin.

Step 1 Press the On/Off button after ice falls from the evaporator at the end of a Harvest cycle. Or, press the On/Off button and allow the ice to melt off the evaporator.



Step 2 To start a cycle, press the Clean button. Water will flow through the water dump valve and down the drain. Wait until the water trough refills, then add the proper amount of ice machine cleaner/descaler to the water trough.


U0140/UF0140 2 ounce (60 ml)U0190/UF0190 5 ounces (150 ml)U0240/UF0240 5 ounces (150 ml)U0310/UF0310 5 ounces (150 ml)

Wait until the cycle is complete (approximately 22 minutes) then press the On/Off button.

40 Part Number 000014797 Rev03 03/21

Ice Machine InspectionCheck all water fittings and lines for leaks. Also, make sure the refrigeration tubing is not rubbing or vibrating against other tubing, panels, etc.

Do not put anything (boxes, etc.) in front of the ice machine. There must be adequate airflow through and around the ice machine to maximize ice production and ensure long component life.

Exterior Cleaning

Clean the area around the ice machine as often as necessary to maintain cleanliness and efficient operation.

Sponge any dust and dirt off the outside of the ice machine with mild soap and water. Wipe dry with a clean, soft cloth.

Cleanup any fallen ice or water spills as they occur.

Part Number 000014797 Rev03 03/21 41

CLEANING THE CONDENSER

General

nWarningDisconnect electric power to the ice machine head section and the remote condensing unit at the electric service switches before cleaning the condenser.

A dirty condenser restricts airflow, resulting in excessively high operating temperatures. This reduces ice production and shortens component life.

• Clean the condenser at least every six months.

nWarningThe condenser fins are sharp. Use care when cleaning them.

• Shine a flashlight through the condenser to check for dirt between the fins.

• Blow compressed air or rinse with water from the inside out (opposite direction of airflow).

NOTE: Cleaning the condenser will require the removal of the bin on some models.

42 Part Number 000014797 Rev03 03/21

REMOVAL FROM SERVICE/WINTERIZATION

Self-contained Air-cooled ice machines

1. Descale and sanitize the ice machine.

2. Press the On/Off button to turn off the ice machine.

3. Turn off the water supply, disconnect and drain the incoming ice-making water line at the rear of the ice machine and drain the water trough.

4. Energize the ice machine, wait one minute for the water inlet valve to open and blow compressed air in both the incoming water and the drain openings in the rear of the ice machine to remove all water.

5. Press the On/Off button and disconnect the electric power at the circuit breaker or the electric service switch.

6. Fill spray bottle with sanitizer and spray all interior food zone surfaces. Do not rinse and allow to air dry.

7. Replace all panels.

Water-cooled ice machines

1. Perform steps 1-6 under “Self-contained Air-cooled Ice Machines”.

2. Disconnect the incoming water and drain lines from the water-cooled condenser.

3. Insert a large screwdriver between the bottom spring coils of the water regulating valve. Pry upward to open the valve.

4. Hold the valve open and blow compressed air through the condenser until no water remains.

Part Number 000014797 Rev03 03/21 43

BIN REMOVALU0140/UF140/U0190/UF190/U0240/UF0240/U0310/UF0310

1. Disconnect power.

2. Remove all ice from bin.

3. Remove air filter and louver from lower front of machine.

4. Loosen screws and rotate clips to release bin from base.

5. Disconnect clamp and remove bin drain.

6. Remove control box panel.

7. Remove communication cable from control board.

8. Remove rear cover.

9. Slide bin forward to remove.

NOTE: When reinstalling the bin, ensure the bin seal is in place and is not pinched/folded as it mates to the cabinet. A watertight seal is required to prevent future condensation or water leakage from entering the ice machine base.

Disconnect communication cable

DISCONNECT CLAMP AND REMOVE BIN DRAIN

Screws and Plates

44 Part Number 000014797 Rev03 03/21

Detailed Descaling and Sanitizing Procedure UDE0065Ice machine cleaner/descaler is used to remove lime scale and mineral deposits. Ice machine sanitizer disinfects and removes algae and slime.

Step 1 Move the toggle switch to Off after ice falls from the evaporator at the end of a Harvest cycle. Or, set the toggle switch to Off and allow the ice to melt off the evaporator.




,CautionDo not mix Ice Machine Cleaner/Descaler and Sanitizer solutions together. It is a violation of Federal law to use these solutions in a manner inconsistent with their labeling.

Step 3 To start a cycle move the toggle switch to Wash.

Step 4 Wait until water flows over the evaporator (about three minutes) then add the proper amount of Manitowoc Ice Machine Cleaner/Descaler (9405463) to the water trough.


UDE0065 1.5 ounces (45 ml)

Part Number 000014797 Rev03 03/21 45

Step 5 Wait until the cycle is complete (approximately 45 minutes) then place the toggle switch in the Off position and disconnect power and water supplies to the ice machine.


Step 6 Remove parts for descaling.

A. Remove the Overflow Tube

• To remove the tube, lift it up while using a slight back and forth motion to loosen it from the drain hole.

When installing the tube, be sure it is completely inserted into the drain hole to prevent water leakage during normal operation.

B. Remove vinyl hose.

• Disconnect the water pump discharge hose from the distribution tube and water pump.

46 Part Number 000014797 Rev03 03/21

C. Remove the Water Pump

• Remove the two thumbscrews and the water pump cover.

• Disconnect the water pump power cord.

• Loosen the screws that hold the water pump in place.

• Lift the water pump and bracket assembly up and off the screws.

D. Remove the Water Trough

• Remove the screws holding the water trough to the walls of the cabinet.



cleaner/descaler part number 9405463

Step 8 Use ½ of the cleaner/descaler and water solution to descale all components. The solution will foam when it contacts lime scale and mineral deposits; once the foaming stops use a soft bristle brush, sponge or cloth (not a wire brush) to carefully descale the parts. Soak the parts for 5 minutes (15 – 20 minutes for heavily scaled parts). Rinse all components with clean water.

Part Number 000014797 Rev03 03/21 47

Step 9 While components are soaking, use ½ of the cleaner/descaler and water solution to descale all foodzone surfaces of the ice machine and bin. Use a nylon brush or cloth to thoroughly descale the following ice machine areas:

• Evaporator plastic parts – including top, bottom and sides.


Rinse all areas thoroughly with clean water.

Step 10 Mix a solution of sanitizer part number 9405653 and warm water.


part number 9405653

Step 11 Use 1/2 of the sanitizer/water solution to sanitize all removed components. Use a cloth or sponge to liberally apply the solution to all surfaces of the removed parts or soak the removed parts in the sanitizer/water solution. Do not rinse parts after sanitizing.

Step 12 Use 1/2 of the sanitizer/water solution to sanitize all foodzone surfaces of the ice machine and bin. Use a cloth or sponge to liberally apply the solution. When sanitizing, pay particular attention to the following areas:




Step 13 Replace all removed components.

48 Part Number 000014797 Rev03 03/21

Step 14 Reapply power and water to the ice machine and place the toggle switch in the WASH position.

Step 15 Add the proper amount of Manitowoc Ice Machine Sanitizer to the water trough.



Step 16 Wait until the sanitize cycle is complete (approximately 45 minutes) then place the toggle switch in the OFF position, disconnect power and water supplies to the ice machine.


Step 17 Repeat step 6 to remove parts for hand sanitizing.



part number 9405653


Part Number 000014797 Rev03 03/21 49


• Evaporator plastic parts - including top, bottom and sides.

• Bin bottom, sides and top.



Step 22 Reapply power and water to the ice machine and place the toggle switch in the ICE position.

Exterior Cleaning

Clean the area around the ice machine as often as necessary to maintain cleanliness and efficient operation.

Sponge any dust and dirt off the outside of the ice machine with mild soap and water. Wipe dry with a clean, soft cloth.

Treat all exterior stainless steel surfaces with a commercial grade stainless steel cleaner/polish.

Ice Machine Inspection

Check all water fittings and lines for leaks. Also, make sure the refrigeration tubing is not rubbing or vibrating against other tubing, panels, etc.

Do not put anything (boxes, etc.) in front of the ice machine. There must be adequate airflow through and around the ice machine to maximize ice production and ensure long component life.

50 Part Number 000014797 Rev03 03/21

CLEANING THE CONDENSERA dirty condenser restricts airflow, resulting in excessively high operating temperatures. This reduces ice production and shortens component life. Clean the condenser at least every six months. Follow the steps below.

1. The washable aluminum filter on self-contained ice machines is designed to catch dust, dirt, lint and grease. This helps keep the condenser clean. Clean the filter with a mild soap and water solution.

2. Clean the outside of the condenser with a soft brush or a vacuum with a brush attachment. Clean from top to bottom, not side to side. Be careful not to bend the condenser fins.

3. Shine a flashlight through the condenser to check for dirt between the fins. If dirt remains: Blow compressed air through the condenser fins from the inside. Be careful not to bend the fan blades.

4. Use a commercial condenser coil cleaner. Follow the directions and cautions supplied with the cleaner.

5. Straighten any bent condenser fins with a fin comb.

6. Carefully wipe off the fan blades and motor with a soft cloth. Do not bend the fan blades. If the fan blades are excessively dirty, wash with warm, soapy water and rinse thoroughly.

Part Number 000014797 Rev03 03/21 51



Special precautions must be taken if the ice machine is to be removed from service for an extended period of time or exposed to ambient temperatures of 32°F (00C) or below.

1. Disconnect the electric power at the circuit breaker or the electric service switch.

2. Turn off the water supply.

3. Remove the water from the water trough.

4. Disconnect the drain and the incoming ice-making water line at the rear of the ice machine.

5. Make sure no water is trapped inside the ice machine incoming water lines, drain lines, distribution tubes, etc.

52 Part Number 000014797 Rev03 03/21

Detailed Descaling and Sanitizing Procedure UDE0080Ice machine cleaner/descaler is used to remove lime scale and mineral deposits. Ice machine sanitizer disinfects and removes algae and slime.

Step 1 Move the toggle switch to Off after ice falls from the evaporator at the end of a Harvest cycle. Or, set the toggle switch to Off and allow the ice to melt off the evaporator.




,CautionDo not mix Ice Machine Cleaner/Descaler (9405463) and Sanitizer (9405653) solutions together. It is a violation of Federal law to use these solutions in a manner inconsistent with their labeling.

Step 3 To start a cycle move the toggle switch to Wash.

Step 4 Wait until water flows over the evaporator (about three minutes) then add the proper amount of Manitowoc Ice Machine Cleaner/Descaler to the water trough.



Part Number 000014797 Rev03 03/21 53

Step 5 Wait until the cycle is complete (approximately 22 minutes) then place the toggle switch in the Off position and disconnect power and water supplies to the ice machine.


Step 6 Remove parts for descaling.

A. Remove Two Thumbscrews and Water Pump Cover.

B. Remove the Vinyl Hose Connecting the Water Pump and Water Distribution Tube.

C. Remove Water Pump

• Disconnect the water pump power cord.

• Loosen the screws securing the pump mounting bracket to the bulkhead.

• Lift the pump and bracket assembly off the mounting screws.

54 Part Number 000014797 Rev03 03/21

D. Remove the Ice Thickness Probe

• Compress the side of the ice thickness probe near the top hinge pin and remove it from the bracket.

NOTE: At this point, the ice thickness probe can easily be descaled. If complete removal is desired follow the ice thickness probe wire to the bulkhead grommet (exit point) in the back wall. Pop the bulkhead grommet out of the back wall by inserting fingernails or a flat object between the back wall and the grommet and prying forward. Pull the bulkhead grommet and wire forward until the connector is accessible, then disconnect the wire lead from the connector.

Ice Thickness Probe Descaling

• Mix a solution of Manitowoc ice machine cleaner/descaler and water (2 ounces of cleaner/descaler to 16 ounces of water) in a container.

• Soak the ice thickness probe a minimum of 10 minutes.

Descale all ice thickness probe surfaces and verify the ice thickness probe cavity is descaled. Rinse thoroughly with clean water, then dry completely. Incomplete rinsing and drying of the ice thickness probe can cause premature harvest.

Part Number 000014797 Rev03 03/21 55

E. Remove the Water Distribution Tube

• Loosen the two thumbscrews, which secure the distribution tube.

• Lift the distribution tube up off the thumbscrews.

Disassembly

• Twist the barbed end until the tab lines up with the key way.

• Pull the inner tube end outward

56 Part Number 000014797 Rev03 03/21

F. Remove the Float Valve

• Turn the splash shield counterclockwise one or two turns.

• Pull the float valve forward and off the mounting bracket.

• Disconnect the water inlet tube from the float valve at the compression fitting.

• Remove the cap and filter screen for descaling.

Part Number 000014797 Rev03 03/21 57

G. Remove the Water Trough

• Apply downward pressure on the siphon tube and remove from the bottom of the water trough.

• Remove the upper thumbscrew.

• While supporting the water trough remove the two thumbscrews from beneath the water trough.

• Remove the water trough from the bin area.

58 Part Number 000014797 Rev03 03/21

H. Remove the ice damper.

• Grasp left side of ice damper and apply pressure against the right-hand ice damper mounting bracket.

• Pull forward on the ice damper until the left hand mounting pin disengages.

Installation

• Grasp the right side of ice damper and place left hand pin in the mounting bracket.

• While applying pressure against the left-hand mounting bracket push the damper until the right-hand mounting pin engages.

Part Number 000014797 Rev03 03/21 59

I. Remove the Bin Door

• Grasp the rear of the bin door and pull bin door forward approximately 5”.

• Slide bin door to the rear while applying upward pressure (The rear door pins will ride up into the track slot and slide backward to the stop tab).

• While applying pressure against the bin door pull down on the rear of each bin door track until the door pins clear the stop tabs.

• Slide the rear door pins off the end and then below the door track. Slide bin door forward allowing the back of the door to lower into the bin. Continue forward with the bin door until the front pins bottom out in the track.

• Lift right side of door until the front pins clear the track, then remove door from bin.

• Remove rollers (4) from all door pins.

60 Part Number 000014797 Rev03 03/21



cleaner/descaler part number 9405463

Step 8 Use ½ of the cleaner/descaler and water solution to descale all components. The solution will foam when it contacts lime scale and mineral deposits; once the foaming stops use a soft bristle brush, sponge or cloth (not a wire brush) to carefully descale the parts. Soak the parts for 5 minutes (15 – 20 minutes for heavily scaled parts). Rinse all components with clean water.

Step 9 While components are soaking, use ½ of the cleaner/descaler and water solution to descale all foodzone surfaces of the ice machine and bin. Use a nylon brush or cloth to thoroughly descale the following ice machine areas:

• Evaporator plastic parts – including top, bottom and sides.


• Rinse all areas thoroughly with clean water.



part number 9405653

Part Number 000014797 Rev03 03/21 61



• Evaporator plastic parts - including top, bottom and sides.




Step 14 Reapply power and water to the ice machine and place the toggle switch in the WASH position.

Step 15 Add the proper amount of Manitowoc Ice Machine Sanitizer to the water trough.



Step 16 Wait until the sanitize cycle is complete (approximately 22 minutes) then place the toggle switch in the OFF position, disconnect power and water supplies to the ice machine.


Step 17 Repeat step 6 to remove parts for hand sanitizing.

62 Part Number 000014797 Rev03 03/21



part number 9405653







Step 22 Reapply power and water to the ice machine and place the toggle switch in the ICE position.

Part Number 000014797 Rev03 03/21 63

CLEANING THE CONDENSERA dirty condenser restricts airflow, resulting in excessively high operating temperatures. This reduces ice production and shortens component life. Clean the condenser at least every six months. Follow the steps below.

1. The washable aluminum filter on self-contained ice machines is designed to catch dust, dirt, lint and grease. This helps keep the condenser clean. Clean the filter with a mild soap and water solution.

2. Clean the outside of the condenser with a soft brush or a vacuum with a brush attachment. Clean from top to bottom, not side to side. Be careful not to bend the condenser fins.

3. Shine a flashlight through the condenser to check for dirt between the fins. If dirt remains: Blow compressed air through the condenser fins from the inside. Be careful not to bend the fan blades.

4. Use a commercial condenser coil cleaner. Follow the directions and cautions supplied with the cleaner.

5. Straighten any bent condenser fins with a fin comb.

6. Carefully wipe off the fan blades and motor with a soft cloth. Do not bend the fan blades. If the fan blades are excessively dirty, wash with warm, soapy water and rinse thoroughly.

64 Part Number 000014797 Rev03 03/21



Special precautions must be taken if the ice machine is to be removed from service for an extended period of time or exposed to ambient temperatures of 32°F (00C) or below.

1. Disconnect the electric power at the circuit breaker or the electric service switch.

2. Turn off the water supply.

3. Remove the water from the water trough.

4. Disconnect the drain and the incoming ice-making water line at the rear of the ice machine.

5. Make sure no water is trapped inside the ice machine incoming water lines, drain lines, distribution tubes, etc.

Part Number 000014797 Rev03 03/21 65

Sequence of Operation U0140/UF0140/U0190/UF0190/UF0240/U0240/U0310/UF0310

TOUCH PAD FEATURESThe touch pad offers a series of pressure sensitive buttons to control ice machine operation and provide operational status.

On/Off - Blue = Machine On Off = Machine Is Off

Delay - Blue = Delay Mode On Off = Delay Mode Is Off

Clean - Yellow = Clean Cycle On Off = Cleaning is Off Flashing = Cleaning Is Paused

Bin Full - Blue = Bin Is Full Off = Bin Is Not Full

Service - Red = Needs Service Off = Doesn’t Need Service

Operation

66 Part Number 000014797 Rev03 03/21

On/Off

The On/Off Button is used to start and stop ice making. The blue light indicates whether the ice machine is in Ice Making (light on) or Off (light off).

NOTE: Stopping and restarting a freeze cycle with ice on the evaporator will result in a thick bridge and larger than normal cubes; or result in an ice slab that will not release from the evaporator.

Delay

Pressing the Delay button will start a delay period. The ice machine will finish the freeze and harvest cycle and then start the delay period.

• Pressing the button once will start a 4 hour delay period.

• Pressing the button twice will start a 12 hour delay period.

• Pressing the button three times will start a 24 hour delay period.

• Pressing the button four times will cancel the delay periods.

NOTE: The delay period will be canceled if power is interrupted to the ice machine. When power is restored, the ice machine will start an ice making cycle.

Part Number 000014797 Rev03 03/21 67

Clean

Pressing the Clean button for 3 seconds will start a clean cycle. After the clean cycle is complete, the ice machine will automatically start an ice making cycle.

• Pressing the Clean button again within 45 seconds of the clean cycle starting will abort the clean cycle.

• Pressing the On/Off button after 45 seconds will pause the Clean cycle. The On/Off light will flash on/off to indicate pause mode. Pressing the On/Off button again will continue the Clean cycle from the point of interruption.

• Pressing the control board test button anytime during the clean cycle will cancel the clean cycle.

• Opening the damper for 30 seconds during the clean cycle will start and automatic shutdown sequence.

Bin Full

The Bin Full light energizes when the bin is full or is de-energized if the bin is not full.

Service

The service light indicates the machine needs attention.

• Refer to safety limits if this light is energized.

68 Part Number 000014797 Rev03 03/21

Ice Making Sequence of Operation

CONTROL BOARD REVISIONS1. Original control board

2. Control board with J4 terminal, which can utilize a thermistor to control when/if a water pump delay occurs in the freeze cycle.

3. Control board with the addition of J8 & J9 terminals. The J8 terminal can control an EC fan motor.

NOTE: The replacement control board is backward compatible and can be used without thermistors or EC fan motors.

SOFTWARE REVISIONSIn addition to the primary sequence of operation the following software changes have been added.

Control boards with water trough thermistor and firmware version before 2.70

The water trough thermistor performs the following function in the freeze cycle:

• When the temperature of the water reaches 34° F the water pump de-energizes for 25 seconds, then re energizes.

• When the water pump restarts the water inlet solenoid energizes for 7 seconds..

2.70 and Higher

• 120 second prechill cycle on initial start and 60 second prechill cycles thereafter.

Part Number 000014797 Rev03 03/21 69

SEQUENCE OF OPERATIONThe On/Off button must be depressed and the ice damper must be closed before the ice machine will start.

The following is the primary sequence of operation. Software revisions will alter some of the timing sequences and are noted in software revisions.

Initial Start-up From Shutoff

The dump valve energizes to purge any water in the water trough down the drain. The harvest valve energizes to equalize refrigerant pressures before the compressor starts.

Freeze Cycle

Prechill - The refrigeration system chills the evaporator before water flow over the evaporator starts. The water inlet valve energizes during the prechill and remains on until the ice thickness float switch is satisfied.

Freeze - Water flowing across the evaporator cools as the freeze cycle progresses. (Software version 2.58 or higher: The water pump turns off for 25 seconds and the water inlet valve energizes for 7 seconds when the pump restarts) Water flowing across the evaporator will start to freeze and build ice on the evaporator. After a sheet of ice has formed, the harvest float switch signals the control board to start a harvest cycle.

Harvest Cycle

Every third cycle the remaining water is purged down the drain. The refrigerant gas warms the evaporator and the sheet of cubes slides off the evaporator and into the storage bin. If all cubes fall clear of the ice damper the ice machine starts another freeze cycle. The maximum harvest time is a total of 7 minutes. If the bin switch does not activate within 3.5 minutes, the harvest cycle extends another 3.5 minutes.

70 Part Number 000014797 Rev03 03/21

Full Bin Cycle

If the ice damper is held open by ice cubes the ice machine shuts off. When the ice damper closes the ice machine starts a new cycle at Initial Start-up From Shutoff. The ice machine will remain off for a 3 minute delay period.

Thaw Cycle

The maximum harvest time is a total of 7 minutes. If the bin switch does not activate within 7 minutes a thaw cycle initiates using the following sequence:

1. The compressor de-energizes.

2. The water inlet valve energizes and fills the water trough.

3. The water pump energizes for 2 minutes and circulates water over the evaporator.

If the bin switch did not open & close.

4. The water dump valve energizes and drains water from the water trough.

5. Step 1 through 4 repeat.

6. If the damper does not open/close after step 5, the control board assumes no ice is on the evaporator and an initial startup cycle starts.

• If the bin switch opens & closes anytime during the thaw cycle the ice machine starts a new freeze cycle.

• If the bin switch opens and remains open for 30 seconds at any point in the thaw cycle the ice machine will enter an automatic shutoff cycle.

• The maximum water fill time for the thaw cycle is 105 seconds for each of the two possible thaw cycles.

Part Number 000014797 Rev03 03/21 71

CONTROL BOARD TIMERS • The ice machine is locked into the freeze cycle for 6

minutes before a harvest cycle can be initiated.

• The freeze time lock in feature is bypassed on the initial cycle (manual start or after a full bin/safety limit condition).

• The water fill valve is de-energized 1 minute after the freeze cycle starts. The control board will energize the water inlet valve one more time 3 minutes into the freeze cycle.

• If the harvest float switch is in the down position for 10 continuous seconds during the start of a freeze cycle, a harvest sequence is initiated.

• The maximum freeze time is 35 minutes at which time the control board automatically initiates a harvest sequence.

• The maximum harvest time is a total of 7 minutes. If the bin switch does not activate within 3.5 minutes, the harvest cycle extends another 3.5 minutes. If 7 minutes is exceeded a thaw cycle starts.

• After the initial harvest cycle from either an automatic shut off or initial start the dump valve solenoid will only energize and purge the water in the water trough every third cycle.

Control boards with thermistor and firmware version before 2.70

The water trough thermistor performs the following function in the freeze cycle:

• When the temperature of the water reaches 34° F the water pump de-energizes for 25 seconds, then re energizes.

• When the water pump restarts the water inlet solenoid energizes for 7 seconds.

72 Part Number 000014797 Rev03 03/21

SAFETY LIMITSSafety limits are stored and indicated by the control board. The number of cycles required to stop the ice machine varies for each safety limit.

Safety limits can be reset by pressing the On/Off button and starting a new ice making cycle.

A safety limit shutdown is indicated by the red Service light on the touch pad.

Safety Limit 1

If the freeze time reaches 35 minutes, the control board automatically initiates a harvest cycle.

• After 3 consecutive 35 minute cycles control board light SL#1 along with the touch pad Service (wrench) light will flash on/off at 1 second intervals.

• If 6 consecutive 35-minute freeze cycles occur, the ice machine stops and the SL#1 light on the control board and the Service (wrench) light on the touch pad will be on continuously.

Safety Limit 2

• If the harvest time reaches 3.5 minutes, the control board automatically energizes the water pump and extends the harvest cycle another 3.5 minutes (7 minutes total).

• If the ice damper does not open and close within the 7 minute harvest cycle the ice machine enters a water thaw cycle for 170 seconds.

• If the damper does not open/close within the 170 second thaw cycle, a second thaw cycle starts.

• The control board automatically initiates a freeze sequence when the thaw cycle(s) is complete.

• If 3 consecutive 7 minute harvest/thaw cycles occur, the ice machine stops.

Part Number 000014797 Rev03 03/21 73

Safety Limit 3

If the freeze time reaches 4 minutes and water is not sensed (float remains down for 10 continuous seconds) the ice machine stops.

• Safety Limit 3 is bypassed on the initial cycle (manual start or after a full bin/safety limit condition). For all subsequent cycles if the freeze time reaches 4 minutes and water is not sensed, the ice machine stops and initiates a 30 minute delay period. Control board lights SL#1 and SL#2 along with the touch pad Service (wrench) light will flash on/off at 1 second intervals.

• The ice machine automatically restarts at the end of the 30 minute delay period and stops flashing the control board and Service (wrench) lights.

• If 100 consecutive failures occur the ice machine stops and the touch pad Service (wrench) light remains energized.

74 Part Number 000014797 Rev03 03/21

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Part Number 000014797 Rev03 03/21 75

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76 Part Number 000014797 Rev03 03/21

Operational Checks

ICE THICKNESS CHECKAfter a harvest cycle, inspect the ice cubes in the ice storage bin. The ice bridge connects the ice cubes and must be set to maintain an ice bridge thickness of 1/8" (3.2 mm). To adjust the thickness of the bridge refer to ice thickness adjustment.

ICE THICKNESS ADJUSTMENTThe ice thickness can be adjusted to three levels.

1. Pull forward on the bottom of the bracket until clear of the tab.

2. Slide the bracket over the desired tab and release.

• The center position is the normal factory setting.

• To increase bridge thickness, raise the water level.

• To decrease bridge thickness, lower the water level.

THICKER BRIDGE

THINNER BRIDGEFACTORY

DEFAULT

Part Number 000014797 Rev03 03/21 77

MINIMUM/MAXIMUM SLAB WEIGHT

ModelMinimum

Ice Weight Per Cycle lbs

Grams

Maximum Ice Weight Per Cycle

lbs Grams

U0140 UF0140

1.13 lbs 513 grams

1.36 lbs 617 grams

U0190/UF0190 2.26 lbs 1025 grams

2.93 lbs 1329 grams

U0240 UF0240

2.26 lbs 1025 grams

2.93 lbs 1329 grams

U0310 UF0310

2.26 lbs 1025 grams

2.93 lbs 1329 grams

78 Part Number 000014797 Rev03 03/21

Sequence of Operation UDE0065Initial startup or startup after automatic shut-off

1. Water Purge

The water fill valve and the hot gas valve are energized for 2.9 minutes (175 seconds). This ensures that the ice making cycle starts with fresh water, and that the refrigerant pressures are equalized prior to refrigeration system start-up.

2. Refrigeration System Start-up

The compressor starts 2.9 minutes (175 seconds) after the water fill valve and hot gas valve are energized. (The water fill valve and hot gas valve remain energized for 5 seconds during compressor start-up, and then shut off.) The compressor remains on throughout the entire freeze and harvest cycles.

3. Freeze Cycle

The condenser fan motor and water pump are energized and remain on throughout the entire freeze cycle. An even flow of water is directed across the evaporator and into each cube cell, where it freezes. The control system automatically determines the length of the freeze cycle by monitoring the temperature of the refrigeration system liquid line.

Part Number 000014797 Rev03 03/21 79

4. Harvest Cycle

The condenser fan motor and water pump de-energize.

The water fill valve energizes to purge the water in the water trough. The hot gas valve also energizes at the beginning of the harvest cycle to divert hot refrigerant gas into the evaporator. The hot refrigerant gas warms the evaporator, causing the cubes to slide, as a sheet, off the evaporator and into the ice storage bin.

The control system automatically determines the length of the harvest cycle, based on the temperature of the refrigeration system liquid line at the end of the freeze cycle. At the end of the harvest cycle, the ice machine returns to another freeze cycle (step 3).

5. Automatic Shut-off

The level of ice in the ice storage bin controls the ice machine shut-off. When the bin is full, ice cubes contact the bin thermostat bulb holder, which cools down and opens to stop the ice machine. The ice machine remains off until enough ice has been removed from the bin. This causes the thermostat bulb holder to warm and close, restarting the ice machine.

When the ice machine restarts, it returns to the startup sequence (steps 1 – 2).

80 Part Number 000014797 Rev03 03/21

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Part Number 000014797 Rev03 03/21 81

ICE THICKNESS ADJUSTMENTIt is normal to have a dimple in the ice cube (a concave indentation in the cube). Cube size is determined by measuring the slab weight (the combined weight of all cubes from one harvest cycle). To determine proper slab weight follow the instructions listed below.

1. Ensure the air filter, front, and back panels are installed properly and close the bin door.

2. During the third harvest cycle open the bin door and catch the entire slab of ice.

3. Weigh the ice slab. The combined weight of all cubes from one harvest should weigh between 200 - 270g (7 - 9-oz). If the slab weight is within this range, the ice machine is working properly and no further action is needed. If the slab weight is not within this range or you desire a slightly thicker or thinner cube, continue to step four.

4. Remove the air filter, the two screws holding the front panel in place and remove the front cover.

5. Locate the ice thickness control dial on the control board (see below). Turn the dial clockwise for a thicker cube or counter clockwise for a thinner cube.

6. Assure all panels and the air filter are reinstalled properly and the bin door is closed. Repeat steps one through three.

82 Part Number 000014797 Rev03 03/21

Sequence of Operation UDE0080Initial start-up or start-up after automatic shut-off

1. Pressure Equalization

Before the compressor starts the hot gas valve is energized for 15 seconds to equalize pressures during the initial refrigeration system start-up.

2. Refrigeration System Start-up

The compressor starts after the 15-second pressure equalization, and remains on throughout the entire Freeze and Harvest Sequences. The hot gas valve remains on for 5 seconds during initial compressor start-up and then shuts off. At the same time the compressor starts, the condenser fan motor (air-cooled models) is supplied with power throughout the entire Freeze and Harvest Sequences. The fan motor is wired through a fan cycle pressure control, therefore it may cycle on and off. (The compressor and condenser fan motor are wired through the relay. As a result, any time the relay coil is energized, the compressor and fan motor are supplied with power.)

3. Prechill

The compressor is on for 30 seconds prior to water flow to prechill the evaporator.

4. Freeze

The water pump starts after the 30-second prechill. An even flow of water is directed across the evaporator and into each cube cell, where it freezes. When sufficient ice has formed, the water flow (not the ice) contacts the ice thickness probe. After approximately 7 seconds of continual water contact, the Harvest Sequence is initiated. The ice machine cannot initiate a Harvest Sequence until a 6-minute freeze time has been surpassed.

Part Number 000014797 Rev03 03/21 83

5. Harvest

The water pump de-energizes stopping flow over the evaporator. The rising level of water in the sump trough diverts water out of the overflow tube, purging excess minerals from the sump trough. The hot gas valve also opens to divert hot refrigerant gas into the evaporator. The refrigerant gas warms the evaporator causing the cubes to slide, as a sheet, off the evaporator and into the storage bin. The sliding sheet of cubes contacts the ice damper, opening the bin switch. The momentary opening and re-closing of the bin switch terminates the harvest cycle and returns the ice machine to freeze (steps 3 - 4).

6. Automatic Shut-off

When the storage bin is full at the end of a harvest sequence, the sheet of cubes fails to clear the ice damper and will hold it down. After the ice damper is held open for 7 seconds, the ice machine shuts off. The ice machine remains off for 3 minutes before it can automatically restart. The ice machine remains off until enough ice has been removed from the storage bin to allow the ice to fall clear of the damper. As the ice damper swings back to the operating position, the bin switch re-closes and the ice machine restarts (steps 1 - 2), provided the 3 minute delay period is complete.

84 Part Number 000014797 Rev03 03/21

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Part Number 000014797 Rev03 03/21 85

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86 Part Number 000014797 Rev03 03/21

Operational Checks UDE0080

SIPHON SYSTEMTo reduce mineral build-up and cleaning frequency, the water in the sump trough must be purged during each harvest cycle.

When the water pump de-energizes the level in the water trough rises above the standpipe starting a siphon action. The siphon action stops when the water level in the sump trough drops. When the siphon action stops, the float valve refills the water trough to the correct level.

Follow steps 1 through 6 under water level check to verify the siphon system functions correctly.

WATER LEVELCheck the water level while the ice machine is in the ice mode and the water pump is running. The correct water level is 1/4” (6.3 mm) to 3/8” (9.5 mm) below the top of the standpipe, a line in the water trough indicates the correct level.

Part Number 000014797 Rev03 03/21 87

WATER LEVEL CHECKThe float valve is factory-set for the proper water level.

If adjustments are necessary:

1. Verify the ice machine is level.

2. Remove the siphon cap from the standpipe.

3. Place the main ON/OFF/WASH toggle switch to the ON position, and wait until the float valve stops adding water.

4. Adjust the water level to [1/4” to 3/8” (6.3 to 9.5 mm) below the standpipe] the line in the water trough:

A. Loosen the two screws on the float valve bracket.

B. Raise or lower the float valve assembly as necessary, then tighten the screws.

C. Move the main ON/OFF/WASH toggle switch to the OFF position. The water level in the trough will rise above the standpipe and run down the drain.

5. Replace the siphon cap on the standpipe, and verify water level and siphon action by repeating steps 3 through 5.

88 Part Number 000014797 Rev03 03/21

ICE THICKNESS CHECKAfter a harvest cycle, inspect the ice cubes in the ice storage bin. The ice thickness probe is set to maintain an ice bridge of 1/8” (3.2 mm). If an adjustment is needed, follow the steps below.

1. Turn the ice thickness probe adjustment screw clockwise for a thicker ice bridge, or counterclockwise for a thinner ice bridge.

2. Make sure the ice thickness probe wire and bracket does not restrict movement of the probe.

1/8” Ice Bridge Thickness

Adjustment Screw

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Troubleshooting U0140/UF0140/U0190/UF0190/U0240/UF0240/U0310/UF0310NOTE: Refer to “Troubleshooting UDE0065” on page 130 and “Troubleshooting UDE0080” on page 155 for these models.

PROBLEM CHECKLIST

Problem Possible Cause Correction

Ice machine does not operate

No electrical power to the ice machine.

Replace the fuse/reset the breaker/turn on the main switch/plug power cord

into receptacle.Ice machine needs to

be turned on.Press the On/Off button to

start ice making.Damper in open position (down).

Damper must be in upright position and capable of

swinging freely.Ice machine stops, and can be restarted by turning the ice machine OFF/ON.

Safety limit feature stopping the ice

machine..

Refer to “Safety Limit Feature”

Ice sheet is thick

Water trough level is too high.

Adjust ice thickness float.

Power button was turned off/on during

freeze cycle and ice remained on

evaporator.

Allow ice to thaw and release from evaporator,

then restart

Ice damper was opened then closed in the

harvest cycle before the ice released.

Allow ice to thaw and release from evaporator,

then restart

Ice machine does not release ice or is slow to harvest.

Ice machine is dirty. Descale and sanitize the ice machine

Ice machine is not level. Level the ice machineLow air temperature around ice machine (air-cooled models).

Air temperature must be at least 40° F (4°C).

Ice machine does not release ice or is slow to harvest.

Water regulating valve leaks in harvest mode

(water-cooled models).

Replace water regulating valve

Troubleshooting

90 Part Number 000014797 Rev03 03/21


Ice machine does not cycle into harvest mode.

The six-minute freeze time lock-in has not

expired yet.

Wait for freeze lock-in to expire.

Harvest float switch is dirty.

Descale and sanitize the ice machine.

Harvest float switch wire is disconnected.

Connect the wire

Harvest float switch is out of adjustment.

Adjust the harvest float switch.

Uneven ice fill (thin at top of evaporator).

Refer to “Shallow or Incomplete Cubes”

Ice quality is poor (soft or not clear).

Poor incoming water quality.

Test the quality of the incoming water and

make appropriate filter recommendations.

Water filtration is poor. Replace the filter.Ice machine is dirty. Descale and sanitize the ice

machine.Water softener is

working improperly (if applicable).

Repair the water softener

Ice machine produces shallow or incomplete cubes, or the ice fill pattern on the evaporator is incomplete.

Ice thickness switch is out of adjustment.

Adjust the ice thickness switch

Water trough level is too high or too low.

Check the water level.

Water filtration is poor. Replace the filter.Hot incoming water. Connect the ice machine to

a cold water supply.Incorrect incoming

water pressure.Water pressure must be 20-

80 psi (137.9 -551.5 kPa)Ice machine is not level. Level the ice machine

Low ice capacity.

The condenser is dirty. Descale the condenser.High air temperature around ice machine (air-cooled models).

Air temperature must not exceed 110° F (43°C).

Inadequate clearance around the ice

machine.

Provide adequate clearance

Objects stacked around ice machine, blocking

condenser airflow

Remove items blocking airflow

Hot incoming water. Connect to cold waterIncorrect incoming

water pressure. Water pressure is too low or

water filter is restricted.

Water pressure must be 20-80 psi (137.9 -551.5 kPa).

Replace water filter.

Part Number 000014797 Rev03 03/21 91


Ice sheet is thick

Water trough level is too high

Adjust ice thickness float

Power button was turned off/on during the freeze cycle and ice remained on the

evaporator

Allow ice to thaw and release from the

evaporator, then restart

Ice damper was opened and closed in the

harvest cycle before the ice released

Allow ice to thaw and release from the

evaporator, then restart

Long harvest cycles with repeated safety

limit indication

Descale the ice machine & perform diagnostic

procedures as required

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CONTROL BOARD TEST MODENOTE: The ice damper/bin switch can be open or closed and does not effect the operation of the test mode.

To enter the test mode press and hold the test switch on the control board for 3 seconds. Refer to “Electronic Control Board UF Models” on page 245 for test button location. The control board test mode performs the following functions for a 2 minute time period:

• Energizes all control board relays

• Energizes all control board lights

• Energizes all touch pad control lights

After the 2 minute test period the control board will complete 500 ice making cycles, then stop.

Canceling a test cycle:

To cancel a test cycle press the test button a second time.

Restarting a test cycle:

The test cycle will restart each time the test button is pressed for a 3 second time period.

OPERATING ICE MACHINE WITH BIN AND TOUCH PAD REMOVEDThe ice machine is designed to allow diagnostic procedures to be performed with the bin removed or to run ice making cycles if a touch pad is defective. The touch pad is attached to the bin and is disconnected during the removal process. Use the control board test mode to operate the ice machine without connecting the touch pad. Refer to “Electronic Control Board UF Models” on page 245 for test button location

NOTE: Software versions before 2.70 operate for 1 cycle in test mode. Software versions after 2.70 operate for 500 cycles in test mode.

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DIAGNOSING AN ICE MACHINE THAT WILL NOT RUN

nWarningHigh (line) voltage is applied to the control board at all times. Removing the control board fuse or pressing the power button will not remove the power supplied to the control board.

1. Verify primary voltage is supplied to ice machine and the fuse/circuit breaker is closed.

2. Verify control board fuse is okay.

NOTE: If any control board lights are on, the fuse is okay.

3. Verify the bin switch functions properly. A defective bin switch can falsely indicate a full bin of ice.

4. Verify power button functions properly. A defective power button may keep the ice machine in the OFF mode. Refer to touch pad diagnostics page 188 when Steps 1 –3 test good.

5. Be sure Steps 1 – 4 were followed thoroughly. Intermittent problems are not usually related to the control board. Replace control board if touch pad operation is correct.

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ICE MACHINE DOES NOT CYCLE INTO HARVEST WHEN THE HARVEST FLOAT IS DOWN/CLOSEDNOTE: The ice machine will make a thick or double slab when a new freeze cycle is started with ice already present on the evaporator.

Two of the most common scenarios are:

• Power is cycled off/on with ice on the evaporator.

• The ice damper/bin switch is opened/closed in the harvest cycle before the ice releases.

Remove all ice from the evaporator before starting diagnostic procedures.

Freeze Time Lock-In Feature

The ice machine control system incorporates a freeze time lock-in feature. This prevents the ice machine from short cycling in and out of harvest. The control board locks the ice machine in the freeze cycle for six minutes. After six minutes a harvest cycle can be initiated. To allow the service technician to initiate a harvest cycle without delay, this feature is not used on the first cycle after pressing the power button OFF and back to ON.

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Step 1 Disconnect power to the ice machine, remove the electrical panel to allow viewing of the control board lights and pull the wire connector for the harvest float switch through the bulkhead and disconnect. Attach a jumper wire to the wire terminals connected to the control board.

Step 2 Bypass the freeze time lock-in feature by pressing the power button to cycle the ice machine on. Wait until water flows over the evaporator, then refer to chart.

Result Correction10 seconds into the freeze cycle the ice machine cycles from freeze to harvest and the control board harvest light energizes.

The ice thickness float switch, connectors or wiring is causing the malfunction.

The harvest light comes on, but the ice machine remains in the freeze cycle.

The ice machine is in a 6 minute freeze lock - Cycle on/off and retest.

The harvest light stays off and the ice machine remains in freeze.

Replace the control board.

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ICE MACHINE CYCLES INTO HARVEST BEFORE THE HARVEST FLOAT IS DOWN/CLOSEDStep 1 Disconnect power to the ice machine, remove the electrical panel to allow viewing of the control board lights and pull the wire connector for the harvest float switch through the bulkhead and disconnect.

WIRE CONNECTORS ARE LOCATED BEHIND BULKHEAD PULL THROUGH GROMMET TO DISCONNECT

Harvest FLOAT SWITCH & BRACKET

ICE THICKNESS FLOAT SWITCH & BRACKET

,CautionDo not disassemble a float for descaling/sanitizing or troubleshooting. The float magnet is not located in the center of the float and incorrect reassembly will result in an ice machine that will not harvest.

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Step 2 Reapply power and press the power button to cycle the ice machine off/on and bypass the freeze time lock-in feature. Wait until water flows over the evaporator, then refer to chart.

Result CorrectionThe harvest light does not come on and the ice machine stays in freeze.

The ice thickness float switch, connectors or wiring is causing the malfunction.

10 seconds into the freeze cycle the ice machine cycles from freeze to harvest and the control board harvest light energizes.

Replace the control board.

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ICE PRODUCTION CHECKThe amount of ice a machine produces directly relates to the operating water and air temperatures. This means an ice machine with a 70°F (21°C) ambient temperature and 50°F (10°C) water produces more ice than the same ice machine with 90°F (32°C) ambient and 70°F (21°C) water.

1. Determine the ice machine operating conditions: Air temp entering condenser:____° Air temp around ice machine:____° Water temp entering sump trough:____°

2. Refer to the appropriate “Cycle Times, 24 Hr. Ice Production and Refrigerant Pressure Charts” on page 219. Use the operating conditions determined in Step 1 to find published 24-Hour Ice Production:_____

• Times are in minutes. Example: 1 min. 15 sec. converts to 1.25 min. (15 seconds ÷ 60 seconds = .25 minutes)

• Weights are in pounds. Example: 2 lb. 6 oz. converts to 2.375 lb. (6 oz. ÷ 16 oz. = .375 lb.)

3. Perform an ice production check using the formula below.

1. + =Freeze Time

Harvest Time Total Cycle Time

2. 1440 ÷ =Minutes in

24 Hrs.Total Cycle

TimeCycles per Day

3. x =Weight of One Harvest

Cycles per Day

Actual 24-Hour Production

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Weighing the ice is the only 100% accurate check.

4. Compare the results of step 3 with step 2. Ice production is normal when these numbers match closely. If they match closely, determine if:

• Another larger ice machine is required.

• Relocating the existing equipment to lower the load conditions is required.

Contact the local Manitowoc distributor for information on available options and accessories.

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INSTALLATION/VISUAL INSPECTION CHECKLIST

Ice machine is not level• Level the ice machine

Condenser is dirty• Clean the condenser

Water filtration is plugged (if used)• Install a new water filter

Water drains are not run separately and/or are not vented• Run and vent drains according to the Installation

Manual

WATER SYSTEM CHECKLISTA water-related problem often causes the same symptoms as a refrigeration system component malfunction.

Example: A water dump valve leaking during the freeze cycle, a system low on charge, and a starving TXV have similar symptoms.

Water system problems must be identified and eliminated prior to replacing refrigeration components.

Water area (evaporator) is dirty• Descale as needed

Water inlet pressure not between 20 and 80 psig (1–5 bar, 138–552 kPa)• Install a water regulator valve or increase the water

pressure

Incoming water temperature is not between 40°F (3°C) and 90°F (32°C)• If too hot, check the hot water line check valves in

other store equipment


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Vent tube is not installed on water outlet drain• See Installation Instructions

Hoses, fittings, etc., are leaking water• Repair/replace as needed

Water valve is stuck open, closed or is leaking• Descale/replace as needed

Water is spraying out of the sump trough area• Stop the water spray

Uneven water flow across the evaporator• Descale the ice machine

Water is freezing behind the evaporator• Correct the water flow

Plastic extrusions and gaskets are not secured to the evaporator• Remount/replace as need.

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ICE FORMATION PATTERNEvaporator ice formation pattern analysis is helpful in ice machine diagnostics.

Analyzing the ice formation pattern alone cannot diagnose an ice machine malfunction. However, when this analysis is used along with Manitowoc’s Refrigeration System Operational Analysis Table, it can help diagnose an ice machine malfunction.

OUTLET

INLET

OUTLET

INLET

UF0140 UF0240 UF0310

Examples of Evaporator Tubing Routing

Normal Ice Formation

Ice forms across the entire evaporator surface.

At the beginning of the Freeze cycle, it may appear that more ice is forming on the inlet of the evaporator than at the outlet. At the end of the Freeze cycle, ice formation at the outlet will be close to, or just a bit thinner than, ice formation at the inlet. The dimples in the cubes at the outlet of the evaporator may be more pronounced than those at the inlet. This is normal.

If ice forms uniformly across the evaporator surface, but does not do so in the proper amount of time, this is still considered a normal ice fill pattern.

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Extremely Thin at Evaporator Outlet

There is no ice, or a considerable lack of ice formation on the outlet of the evaporator.

Examples: No ice at all at the outlet of the evaporator, but ice forms at the inlet half of the evaporator. Or, the ice at the outlet of the evaporator reaches the correct thickness, but the outlet of the evaporator already has 1/2” to 1” of ice formation.

Possible cause: Water loss, low on refrigerant, starving TXV, hot water supply, faulty float valve, etc.

Extremely Thin at Evaporator Inlet

There is no ice, or a considerable lack of ice formation at the inlet of the evaporator. Examples: The ice at the outlet of the evaporator reaches the correct thickness, but there is no ice formation at all at the inlet of the evaporator.

Possible cause: Insufficient water flow, flooding TXV, etc.

Spotty Ice Formation

There are small sections on the evaporator where there is no ice formation. This could be a single corner, or a single spot in the middle of the evaporator. This is generally caused by loss of heat transfer from the tubing on the backside of the evaporator.

No Ice Formation

The ice machine operates for an extended period, but there is no ice formation at all on the evaporator.

Possible cause: Water float valve, water pump, starving expansion valve, low refrigerant charge, compressor, etc.

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SAFETY LIMIT FEATUREIn addition to the standard safety controls, your Manitowoc ice machine features built-in safety limits that will stop the ice machine if conditions arise which could cause a major component failure.

Service Light: The Service light energizes whenever a safety limit has been exceeded.

Safety Limit 1

If the freeze time reaches 45 minutes, the control board automatically initiates a harvest cycle.

• After 3 consecutive 45minute cycles, control board light SL#1 along with the touch pad service (wrench) light will flash on/off at 1 second intervals.

• If 6 consecutive 45-minute freeze cycles occur, the ice machine stops and the SL#1 light on the control board and the Service (wrench) light on the touch pad will be on continuously.

Safety Limit 2

• If the harvest time reaches 3.5 minutes, the control board automatically energizes the water pump and extends the harvest cycle another 3.5 minutes (7 minutes total).

• If the ice damper does not open and close within the 7 minute harvest cycle the ice machine enters a water thaw cycle for 170 seconds.

• If the damper does not open/close within the 170 second thaw cycle, a second thaw cycle starts.

• The control board automatically initiates a freeze sequence when the thaw cycle(s) is complete.

• If 3 consecutive 7 minute harvest/thaw cycles occur, the ice machine stops and the SL#2 light on the control board and the Service (wrench) light on the touch pad will be on continuously.

Part Number 000014797 Rev03 03/21 105

Safety Limit 3

If the freeze time reaches 4 minutes and water is not sensed (float remains down for 10 continuous seconds) the ice machine stops.

• Safety Limit 3 is bypassed on the initial cycle (manual start or after a full bin/safety limit condition). For all subsequent cycles if the freeze time reaches 4 minutes and water is not sensed, the ice machine stops and initiates a 30 minute delay period. Control board lights SL#1 and SL#2 along with the touch pad Service (wrench) light will flash on/off at 1 second intervals.

• The ice machine automatically restarts at the end of the 30 minute delay period and stops flashing the control board and Service (wrench) lights.

• If 100 consecutive failures occur the ice machine stops and the touch pad Service (wrench) light remains energized.

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Determining Which Safety Limit Stopped the Ice Machine:

When a safety limit condition causes the ice machine to stop, the safety limit light on the control board continually flashes on and off.

CONTROL BOARD SAFETY LIMIT LIGHT OPERATION, BEFORE THE POWER BUTTON HAS BEEN CYCLED ON/OFF:Watch the safety limit lights on the control board:

• SL#1 flashes = 3 or more 35 minute cycles

• SL#1 continuously on = Six 35minute freeze cycles

• SL#2 flashes = One 3.5 minute harvest cycles

• SL#2 continuously on = 3 consecutive 3.5 minute harvest cycles

• SL#1 & SL#2 flash = SL#3, neither float opened within 4 minutes of the freeze cycle.

CONTROL BOARD SAFETY LIMIT LIGHT OPERATION USING THE POWER BUTTON:1. Press the power button once.

2. Press the power button again to start ice making.

3. Watch the safety limit lights.

• One will flash corresponding to safety limits 1 or 2.

4. Safety limit 3 is indicated by both SL#1 & SL#2 flashing.

After safety limit indication, the ice machine will restart and run until a safety limit is exceeded again.

Part Number 000014797 Rev03 03/21 107

Safety Limit Notes

• A continuous run of 100 harvests automatically erases the safety limit code.

• The control board will store and indicate only one safety limit – the last one exceeded.

• If the power button is cycled OFF and then ON prior to reaching the 100-harvest point, the last safety limit exceeded will be indicated.

Safety Limit Checklist

The following checklists are designed to assist the service technician in analysis. However, because there are many possible external problems, do not limit your diagnosis to only the items listed.

Safety Limit #1

Freeze time exceeds 35 minutes for 3 consecutive freeze cycles.

Possible Cause Checklist

Improper installation• Refer to “Installation/Visual Inspection Checklist” on

page 100

Water System• Water Level too high or defective float switch (water

escaping water trough)

• Low water pressure (20 psig min.)

• High water pressure (80 psig max.)

• High water temperature (90°F/32.2°C max.)

• Clogged water distribution tube

• Dirty/defective water inlet valve

• Defective water pump

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Electrical System• Harvest cycle not initiated electrically

• Contactor not energizing

• Compressor electrically non-operational

• Restricted condenser air flow

• High inlet air temperature (110°F/43.3°C max.)

• Condenser discharge air re-circulation

• Dirty condenser fins

• Defective fan cycling control

• Defective fan motor



• Dirty condenser

Refrigeration System• Non-Manitowoc components

• Improper refrigerant charge

• Defective compressor

• TXV starving or flooding (check bulb mounting)

• Non-condensible in refrigeration system

• Plugged or restricted high side refrigerant lines or component

• Defective harvest valve

Part Number 000014797 Rev03 03/21 109

Safety Limit #2

Harvest time exceeds 3.5 minutes for 3 Consecutive harvest cycles.



page 100

Water System• Water area (evaporator) dirty

• Dirty/defective water dump valve

• Vent tube not installed on water outlet drain

• Water freezing behind evaporator

• Plastic extrusions and gaskets not securely mounted to the evaporator


• Loss of water from sump area




Electrical system• Water inlet valve defective

• Bin switch defective

• Premature harvest

Refrigeration system• Non-Manitowoc components



• TXV flooding (check bulb mounting)


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Safety Limit 3

Freeze time reaches 4 minutes and water is not sensed.



page 100

Water System• Dirty/defective water dump valve

• Low water float valve dirty or defective



• Dirty defective water filter (when used)



Electrical system• Water inlet valve coil defective

• Low water float valve defective

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ANALYZING DISCHARGE PRESSURE 1. Determine the ice machine operating conditions:

Air temperature entering condenser ______

Air temperature around ice machine ______

Water temperature entering sump trough ______

2. Refer to “Installation/Visual Inspection Checklist” on page 100 for ice machine being checked.

Use the operating conditions determined in step 1 to find the published normal discharge pressures.

Freeze Cycle ______

Harvest Cycle ______

3. Perform an actual discharge pressure check.

Freeze Cycle PSIG

Harvest Cycle PSIG

Beginning of Cycle __________ __________

Middle of Cycle __________ __________

End of Cycle __________ __________

4. Compare the actual discharge pressure (Step 3) with the published discharge pressure (Step 2).

The discharge pressure is normal when the actual pressure falls within the published pressure range for the ice machine’s operating conditions. It is normal for the discharge pressure to be higher at the beginning of the freeze cycle (when load is greatest), then drops throughout the freeze cycle.

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Discharge Pressure High Checklist

Improper Installation• Refer to “Installation/Visual Inspection Checklist” on

page 100

Restricted Condenser Air Flow• High inlet air temperature





Improper Refrigerant Charge• Overcharged

• Non-condensible in system

• Wrong type of refrigerant

Other• Non-Manitowoc components in system

• High side refrigerant lines/component restricted (before mid-condenser)

Freeze Cycle Discharge Pressure Low Checklist


page 100

Improper Refrigerant Charge• Undercharged




• Defective fan cycle control

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ANALYZING SUCTION PRESSURE The suction pressure gradually drops throughout the freeze cycle. The actual suction pressure (and drop rate) changes as the air and water temperature entering the ice machine changes. These variables also determine the freeze cycle times.

To analyze and identify the proper suction pressure drop throughout the freeze cycle, compare the published suction pressure to the published freeze cycle time.

NOTE: Analyze discharge pressure before analyzing suction pressure. High or low discharge pressure may be causing high or low suction pressure.

Procedure

Step1. Determine the ice machine operating conditions.

Example:Air temperature entering condenser: 90°F/32.2°CAir temperature around ice machine: 80°F/26.7°CWater temperature entering water fill valve: 70°F/21.1°C

2A. Refer to “Cycle Time” and “Operating Pressure” charts for ice machine model being checked. Using operating conditions from Step 1, determine published freeze cycle time and published freeze cycle suction pressure.

Example:Published freeze cycle time: 14.8 - 15.9 minutesPublished freeze cycle suction pressure: 65 - 26 psig

2B. Compare the published freeze cycle time and published freeze cycle suction pressure. Develop a chart.

Example:Published Freeze Cycle Time (minutes)

1 2 4 7 10 12 14| | | | | | |

65 55 47 39 34 30 26

Published Freeze Cycle Suction Pressure (psig) In the example, the proper suction pressure should be approximately 39 psig at 7 minutes; 30 psig at 12 minutes; etc.

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Step3. Perform an actual suction pressure check at the beginning, middle and end of the freeze cycle. Note the times at which the readings are taken.

Example:Manifold gauge set was connected to the example ice machine and suction pressure readings taken as follows: ________ PSIGBeginning of freeze cycle: 79 (at 1 min.)Middle of freeze cycle: 48 (at 7 min.)End of freeze cycle: 40 (at 14 min.)

4. Compare the actual freeze cycle suction pressure (Step 3) to the published freeze cycle time and pressure comparison (Step 2B). Determine if the suction pressure is high, low or acceptable.

Example:In this example, the suction pressure is considered high throughout the freeze cycle. It should have been:Approximately 65 psig (at 1 minute) – not 79Approximately 39 psig (at 7 minutes) – not 48Approximately 26 psig (at 14 minutes) – not 40

Part Number 000014797 Rev03 03/21 115

Suction Pressure High Checklist


page 100

Discharge Pressure• Discharge pressure is too high, and is affecting suction

pressure, refer to “Discharge Pressure High Checklist” on page 112.





• Harvest valve leaking



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Suction Pressure Low Checklist


page 100

Discharge Pressure• Discharge pressure is too low, and is affecting suction

pressure, refer to “Freeze Cycle Discharge Pressure Low Checklist” on page 112.




• Improper water supply over evaporator refer to ”Water System Checklist” on page 100.

• Loss of heat transfer from tubing on back side of evaporator

• Restricted/plugged liquid line drier

• Restricted/plugged tubing in suction side of refrigeration system

• TXV starving

NOTE: Do not limit your diagnosis to only the items listed in the checklists.

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HARVEST VALVE

General

The harvest valve is an electrically operated valve that opens when energized, and closes when de-energized.

Normal Operation

The valve is de-energized (closed) during the freeze cycle and energized (open) during the harvest cycle. The valve is positioned between the receiver and the evaporator and performs two functions:

1. Prevents refrigerant from entering the evaporator during the freeze cycle.

The harvest valve is not used during the freeze cycle. The harvest valve is de-energized (closed) preventing refrigerant flow from the receiver into the evaporator.

2. Allows refrigerant vapor to enter the evaporator in the harvest cycle.

During the harvest cycle, the harvest valve is energized (open) allowing refrigerant gas from the discharge line of the compressor to flow into the evaporator. The heat is absorbed by the evaporator and allows release of the ice slab.

Exact pressures vary according to ambient temperature and ice machine model. Harvest pressures can be found in the “Cycle Times, 24 Hr. Ice Production and Refrigerant Pressure Charts” on page 219.

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Harvest Valve Analysis

The valve can fail in two positions:

• Valve will not open in the harvest cycle.

• Valve remains open during the freeze cycle.

VALVE WILL NOT OPEN IN THE HARVEST CYCLEAlthough the circuit board has initiated a harvest cycle, the evaporator temperature remains unchanged from the freeze cycle.

VALVE REMAINS OPEN IN THE FREEZE CYCLE:Symptoms of a harvest valve remaining partially open during the freeze cycle can be similar to symptoms of an expansion valve, float valve or compressor problem. Symptoms are dependent on the amount of leakage in the freeze cycle.

A small amount of leakage will cause increased freeze times and an ice fill pattern that is “Thin at the Outlet”, but fills in at the end of the cycle.

As the amount of leakage increases the length of the freeze cycle increases and the amount of ice at the outlet of the evaporator decreases.

Refer to the Parts Manual for proper valve application. If replacement is necessary, use only “original” Manitowoc replacement parts.

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Use the following procedure and table to help determine if a harvest valve is remaining partially open during the freeze cycle.

1. Wait five minutes into the freeze cycle.

2. Feel the inlet of the harvest valve(s).

Important�Feeling the harvest valve outlet or across the harvest valve itself will not work for this comparison.

The harvest valve outlet is on the suction side (cool refrigerant). It may be cool enough to touch even if the valve is leaking.

3. Feel the compressor discharge line.

nWarningThe inlet of the harvest valve and the compressor discharge line could be hot enough to burn your hand. Just touch them momentarily.

4. Compare the temperature of the inlet of the harvest valves to the temperature of the compressor discharge line.

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Findings CommentsThe inlet of the harvest valve is cool enough to touch and the compressor discharge

line is hot.

Cool & Hot

This is normal as the discharge line should always be too hot to

touch and the harvest valve inlet, although too hot to touch during harvest, should be cool enough

to touch after 5 minutes into the freeze cycle.

The inlet of the harvest valve is hot and approaches

the temperature of a hot compressor discharge line.

Hot & Hot

This is an indication something is wrong, as the harvest valve inlet

did not cool down during the freeze cycle. If the compressor dome is also entirely hot, the problem is not a harvest valve leaking, but rather something

causing the compressor (and the entire ice machine) to get hot.

Both the inlet of the harvest valve and the compressor

discharge line are cool enough to touch.

Cool & Cool

This is an indication something is wrong, causing the compressor discharge line to be cool to the touch. This is not caused by a

harvest valve leaking.

5. Record your findings on the table.

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COMPARING EVAPORATOR INLET/OUTLET TEMPERATURESThe temperatures of the suction lines entering and leaving the evaporator alone cannot diagnose an ice machine. However, comparing these temperatures during the freeze cycle, along with using Manitowoc’s Refrigeration System Operational Analysis Table, can help diagnose an ice machine malfunction.

The actual temperatures entering and leaving the evaporator vary by model, and change throughout the freeze cycle. This makes documenting the “normal” inlet and outlet temperature readings difficult. The key to the diagnosis lies in the difference between the two temperatures five minutes into the freeze cycle. These temperatures must be within 7°F (4°C) of each other.

Use this procedure to document freeze cycle inlet and outlet temperatures.

1. Use a quality temperature meter, capable of taking temperature readings on curved copper lines.

2. Attach the temperature meter sensing device to the copper lines entering and leaving the evaporator.

Important�Do not simply insert the sensing device under the insulation. It must be attached to and reading the actual temperature of the copper line.


4. Record the temperatures below and determine the difference between them.

___________ ___________ ___________Inlet Temperature Difference must be within

7°F (4°C) at 5 minutes into the freeze cycle

Outlet Temperature

5. Use this with other information gathered on the Refrigeration System Operational Analysis Table to determine the ice machine malfunction.

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DISCHARGE LINE TEMPERATURE ANALYSIS

GENERALKnowing if the discharge line temperature is increasing, decreasing or remaining constant can be an important diagnostic tool. Maximum compressor discharge line temperature on a normally operating ice machine steadily increases throughout the freeze cycle. Comparing the temperatures over several cycles will result in a consistent maximum discharge line temperature.

Ambient air temperatures affect the maximum discharge line temperature.

Higher ambient air temperatures at the condenser = higher discharge line temperatures at the compressor.

Lower ambient air temperatures at the condenser = lower discharge line temperatures at the compressor.

Regardless of ambient temperature, the freeze cycle discharge line temperature will be higher than 150°F (66°C) on a normally operating ice machine.

PROCEDUREConnect a temperature probe on the compressor discharge line within 6” (15.2 cm) of the compressor. Observe the discharge line temperature for the last three minutes of the freeze cycle and record the maximum discharge line temperature.

Part Number 000014797 Rev03 03/21 123

Discharge Line Temperature Above 150°F (66°C) at End of Freeze Cycle:

Ice machines that are operating normally will have consistent maximum discharge line temperatures above 150°F (66°C).

Verify the expansion valve sensing bulb is positioned and secured correctly.

Discharge Line Temperature Below 150°F (66°C) at End of Freeze Cycle

Ice machines that have a flooding expansion valve will have a maximum discharge line temperature that decreases each cycle.

Verify the expansion valve sensing bulb is 100% insulated and sealed airtight. Condenser air contacting an incorrectly insulated sensing bulb will cause overfeeding of the expansion valve.

124 Part Number 000014797 Rev03 03/21

REFRIGERATION COMPONENT DIAGNOSTICSAll electrical and water related problems must be corrected before these charts will work properly. These tables must be used with charts, checklists and other references to eliminate refrigeration components not listed and external items and problems that will cause good refrigeration components to appear defective.

The tables list four different defects that may affect the ice machine’s operation.

NOTE: A low-on-charge ice machine and a starving expansion valve have very similar characteristics and are listed under the same column.

Procedure

Step 1 Complete each item individually in the “Operational Analysis” column.

Enter check marks in the boxes.

Each time the actual findings of an item in the “Operational Analysis” column matches the published findings on the table, enter a check mark.

Example: Freeze cycle suction pressure is determined to be low. Enter a check mark in the “low” box.

Perform the procedures and check all information listed. Each item in this column has supporting reference material.

While analyzing each item separately, you may find an “external problem” causing a good refrigerant component to appear bad. Correct problems as they are found. If the operational problem is found, it is not necessary to complete the remaining procedures.

Step 2 Add the check marks listed under each of the four columns. Note the column number with the highest total and proceed to “Final Analysis.”

NOTE: If two columns have matching high numbers, a procedure was not performed properly and/or supporting material was not analyzed correctly.

Part Number 000014797 Rev03 03/21 125

Final Analysis

The column with the highest number of check marks identifies the refrigeration problem.

Column 1 – Harvest Valve Leaking

A leaking harvest valve must be replaced.

Column 2 – Low Charge/TXV Starving

Normally, a starving expansion valve only affects the freeze cycle pressures, not the harvest cycle pressures. A low refrigerant charge normally affects both pressures. Verify the ice machine is not low on charge before replacing an expansion valve.

Add refrigerant charge in 2 oz. increments as a diagnostic procedure to verify a low charge. (Do not add more than the total charge of refrigerant). If the problem is corrected, the ice machine is low on charge. Find the refrigerant leak.

The ice machine must operate with the nameplate charge. If the leak cannot be found, proper refrigerant procedures must still be followed. Change the liquid line drier, evacuate the system and weigh in the proper charge.

If the problem is not corrected by adding charge, the expansion valve is faulty.

Column 3 – TXV Flooding

A loose or improperly mounted expansion valve bulb causes the expansion valve to flood. Check bulb mounting, insulation, etc., before changing the valve.

Column 4 – Compressor

Replace the compressor and start components. To receive warranty credit, the compressor ports must be properly sealed by crimping and soldering them closed. Old start components must be returned with the faulty compressor.

126 Part Number 000014797 Rev03 03/21

REFR

IGER

ATIO

N A

NA

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____

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Part Number 000014797 Rev03 03/21 127

Ope

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128 Part Number 000014797 Rev03 03/21

Ope

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34

Free

ze C

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D

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ssur

e __

____

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____

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1

min

ute

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dle

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nd

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is H

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Su

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re__

____

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Part Number 000014797 Rev03 03/21 129

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130 Part Number 000014797 Rev03 03/21

Troubleshooting UDE0065


nWarningHigh (line) voltage is applied to the control board (terminals #2 and #4) at all times. Removing control board fuse or moving the toggle switch to OFF will not remove the power supplied to the control board.


2. Verify control board fuse is okay. If the bin switch light functions, the fuse is okay.


4. Verify ON/OFF/WASH toggle switch functions properly. A defective toggle switch may keep the ice machine in the OFF mode.

5. Verify low DC voltage is properly grounded. Loose DC wire connections may intermittently stop the ice machine.

6. Replace the control board - Be sure Steps 1 – 5 were followed thoroughly. Intermittent problems are not usually related to the control board.

Part Number 000014797 Rev03 03/21 131

REFRIGERATION DIAGNOSTICS OVERVIEW UDE0065UDE0065 ice machines have a very small refrigerant charge and we do not recommend diagnosing the ice machine using refrigerant pressures. For this reason refrigeration access fittings are not installed during production and the ice machine is diagnosed with temperatures.

Verify that your water flow is even across the entire evaporator before diagnosing the refrigeration system. Mineral build-up on the evaporator assembly can cause water tracking and an erratic ice fill pattern. Descale with Manitowoc Ice Machine cleaner/descaler to remove any mineral buildup before diagnosing the refrigeration system.

The following can be used for diagnostics:

1. Install a temperature lead on the compressor suction line within 6” of the compressor.

2. Install a temperature lead on the compressor discharge line within 6” of the compressor

3. Refer to the “Cycle Times, 24 Hr. Ice Production and Refrigerant Pressure Charts” on page 219 to determine the correct temperature operating range for your air and water temperature.

4. Record the temperatures throughout the freeze and harvest cycles.

NOTE: First cycle is not used for refrigeration system diagnostics. Run a minimum of two cycles to allow the system to stabilize and record the second cycle.

132 Part Number 000014797 Rev03 03/21

Normal Operation

Example below is for normal operation at 86°F (30°C) air temperature 68°F (20°C) water temperature.

FREEZE CYCLE• Normal suction line temperature at the compressor

will range from 86°F (30°C) three minutes into the cycle to 8°F (-13°C) at the end of the freeze cycle.

• Normal discharge line temperature at the compressor will range from 168°F (76°C) to 140°F (60°C) through the freeze cycle.

HARVEST CYCLESuction line temperature at the compressor will range from 64°F (18°C) to 111°F (44°C) through the harvest cycle. An obstructed capillary tube will not effect suction line temperature range during the harvest cycle. Low refrigerant charge will have a lower temperature than normal.

Discharge line temperature at the compressor will range from 180°F (82°C) to 150°F (60°C) through the harvest cycle.

Ice fill pattern will vary depending on severity of the obstruction or refrigeration loss. Ice fill patterns will range from no ice on the entire evaporator to thin only at the evaporator outlet (thin at the bottom, thick at the top of the evaporator).

Part Number 000014797 Rev03 03/21 133

Abnormal temperatures

Higher than normal freeze cycle temperatures.

• A dirty filter or condenser will result in higher than normal temperatures. Always clean the filter and condenser before diagnosing the refrigeration system.

• Hot water entering the ice machine will result in high suction and discharge line temperatures in the freeze cycle.

Capillary tube failures or low refrigerant charge will always result in a starving evaporator.

• An obstructed capillary tube or low refrigerant charge will have a suction line temperature higher than normal.

• An obstructed capillary tube or low refrigerant charge will have a discharge line temperature lower than normal.

• An obstructed capillary tube will not effect the discharge line temperature during the harvest cycle. A low freeze and discharge line temperature in the freeze cycle with a normal harvest cycle discharge line temperature indicates an obstructed capillary tube.

• Low refrigerant charge will have both the suction and discharge line temperatures lower than normal in the freeze and harvest cycles.

134 Part Number 000014797 Rev03 03/21


1. Determine the ice machine operating conditions: Air temp entering condenser:____° Air temp around ice machine:____° Water temp entering sump trough:____°

2. Refer to the appropriate “Cycle Times, 24 Hr. Ice Production and Refrigerant Pressure Charts” on page 219. Use the operating conditions determined in Step 1 to find published 24-Hour Ice Production:_____




1. + =Freeze Time



24 Hrs.Total Cycle

TimeCycles per Day


Cycles per Day


Part Number 000014797 Rev03 03/21 135






136 Part Number 000014797 Rev03 03/21






Manual

Part Number 000014797 Rev03 03/21 137





pressure







Continued Next Page

138 Part Number 000014797 Rev03 03/21


Water is leaking through the sump trough overflow• Set the water level 1/4”-3/8” below standpipe



Plastic extrusions and gaskets are not secured to the evaporator• Remount/replace as needed.

Part Number 000014797 Rev03 03/21 139

UDE0065 Refrigeration DiagnosticsPerform the procedures on the preceding pages before performing refrigeration diagnostics. The first pages cover an overview of the diagnostic procedures followed by diagnostics checklists.

Install thermometer thermocouples on Suction and Discharge line:

• Digital thermometers with remote thermocouples must be used to obtain temperatures.

• Suction and Discharge line thermocouples must be within 3” (76.2 mm) of the compressor.

• Thermocouples must be insulated.

• Doors and all panels must be in place.

• Initial freeze cycle is not used for diagnostics.

• Start monitoring temperatures 3 minutes into the second freeze cycle.

Compare Suction and Discharge temperatures to your model in the charts starting on page 220.

The charts list normal suction and discharge temperatures.

Analysis

Discharge Line Temp

Suction Line Temp

Ice Fill Pattern Refer to Diagnostics

for:Normal Normal Less fill on the

left side of the evaporator

This is normal operation

Low (20°F [-7°C] or more)

Low 20°F (-7°C) or more)

Less fill on the left side of the

evaporator

Expansion Valve Flooding

Normal orHigh

High 10°F (-12°C) or

more)

Less fill on the left side and top 2 rows of

the evaporator

Low on Refrigerant

or Expansion Valve Starving

Normal Low 5°F (-15°C) or less)


evaporator

Refrigerant Overcharge

140 Part Number 000014797 Rev03 03/21

FLOODING EXPANSION VALVE SYMPTOMSA flooding expansion valve will have discharge and suction line temperatures 20°F (-7°C) lower than normal freeze cycle temperatures. Normal suction line temperature and low discharge line temperature DO NOT verify a flooding valve. Both discharge line temperature and suction line temperature must be low to verify a flooding expansion valve. Ice fill pattern is thin on the left hand side of the evaporator.

STARVING EXPANSION VALVE/LOW REFRIGERANT CHARGE SYMPTOMS:

A. Ice Fill Pattern

• Thin on top two rows of the evaporator

• Thin on entire left side of the evaporator

• Thick on the bottom of the evaporator

B. Freeze time longer than normal

Diagnosis can be confirmed by adding installing a temporary access valve and adding 2 oz (56.7 g) of refrigerant: If the suction line temperature drops or the ice fill pattern on the top two rows fills in, the ice machine is low on refrigerant. Refer to charging procedures for access valve installation/removal procedure.

OVERCHARGED SYSTEM SYMPTOMSSuction line temperature will be slightly low during freeze cycle 5°F (-15°C). Discharge line temperature is normal. Actual amperage readings will be higher than nameplate rating.

Part Number 000014797 Rev03 03/21 141

ANALYZING ICE FORMATION PATTERNEvaporator ice formation pattern analysis is helpful in ice machine diagnostics.


OUTLET

INLET





142 Part Number 000014797 Rev03 03/21



Examples: No ice at all at the outlet of the evaporator, but ice forms at the inlet half of the evaporator. Or, the ice at the outlet of the evaporator reaches the correct thickness, but the outlet of the evaporator already has 1/2” to 1” of ice formation.







No Ice Formation



Part Number 000014797 Rev03 03/21 143

ANALYZING DISCHARGE LINE TEMPERATURE 1. Determine the ice machine operating conditions:





Use the operating conditions determined in step 1 to find the published normal discharge temperatures.

Freeze Cycle ______


3. Perform an actual discharge temperature check.

Freeze Cycle Temperature

Harvest Cycle Temperature


Middle of Cycle __________ __________

End of Cycle __________ __________

4. Compare the actual discharge temperature (Step 3) with the published discharge temperature (Step 2).

The discharge temperature is normal when the actual temperature falls within the published temperature range for the ice machine’s operating conditions. It is normal for the discharge temperature to be lower at the beginning of the freeze cycle, then climb through out the freeze cycle.

144 Part Number 000014797 Rev03 03/21

Discharge Line Temperature High Checklist


page 136











Freeze Cycle Discharge Temperature Low Checklist


page 136






Part Number 000014797 Rev03 03/21 145

ANALYZING SUCTION LINE TEMPERATURE The suction line temperature gradually drops throughout the freeze cycle. The actual suction temperature (and drop rate) changes as the air and water temperature entering the ice machine changes. These variables also determine the freeze cycle times. To analyze and identify the proper suction temperature drop throughout the freeze cycle, compare the published suction temperature to the published freeze cycle time.

NOTE: Analyze discharge temperature before analyzing suction temperature. High or low discharge temperature may be causing high or low suction temperature.

1. Determine the ice machine operating conditions:




Use the operating conditions determined in step 1 to find the published normal suction temperatures.

Freeze Cycle ______


2. Perform an actual suction temperature check.



Beginning of Cycle __________ __________Middle of Cycle __________ __________

End of Cycle __________ __________

3. Compare the actual suction temperature (Step 3) with the published suction temperature (Step 2).

The suction temperature is normal when the actual temperature falls within the published temperature range for the ice machine’s operating conditions. It is normal for the suction temperature to be higher at the beginning of the freeze cycle, then drop through out the freeze cycle.

146 Part Number 000014797 Rev03 03/21

Suction Temperature High Checklist


page 136

Discharge Pressure• Discharge temperature is too high, and is affecting

suction temperature, refer to “Discharge Line Temperature High Checklist” on page 144.








Part Number 000014797 Rev03 03/21 147

Suction Temperature Low Checklist


page 136

Discharge Pressure• Discharge temperature is too low, and is affecting

suction temperature, refer to “Freeze Cycle Discharge Temperature Low Checklist” on page 144.








• TXV starving


148 Part Number 000014797 Rev03 03/21

COMPARING EVAPORATOR INLET/OUTLET TEMPERATURESThe temperatures of the suction line entering and leaving the evaporator alone cannot diagnose an ice machine. However, comparing these temperatures during the freeze cycle can help diagnose an ice machine malfunction.










Outlet Temperature


Part Number 000014797 Rev03 03/21 149



Ambient air temperatures affect the maximum discharge line temperature.

Higher ambient air temperatures at the condenser = higher discharge line temperatures at the compressor.

Lower ambient air temperatures at the condenser = lower discharge line temperatures at the compressor.

Regardless of ambient temperature, the freeze cycle discharge line temperature will be higher than 150°F (66°C) on a normally operating ice machine.


150 Part Number 000014797 Rev03 03/21







Part Number 000014797 Rev03 03/21 151

HARVEST VALVE

General


Normal Operation

The valve is de-energized (closed) during the freeze cycle and energized (open) during the harvest cycle. The valve is positioned between the and the evaporator and performs two functions:





Exact temperatures vary according to ambient temperature and ice machine model.

152 Part Number 000014797 Rev03 03/21










Part Number 000014797 Rev03 03/21 153









154 Part Number 000014797 Rev03 03/21


line is hot.

Cool & Hot






Hot & Hot






Cool & Cool



Part Number 000014797 Rev03 03/21 155

Troubleshooting UDE0080


nWarningHigh (line) voltage is applied to the control board (terminals #2 and #4) at all times. Removing control board fuse or moving the toggle switch to OFF will not remove the power supplied to the control board.


2. Verify control board fuse is okay.

3. If the bin switch light functions, the fuse is okay.


5. Verify ON/OFF/WASH toggle switch functions properly. A defective toggle switch may keep the ice machine in the OFF mode.

6. Verify low DC voltage is properly grounded. Loose DC wire connections may intermittently stop the ice machine.

7. Be sure Steps 1 – 6 were followed thoroughly. Intermittent problems are not usually related to the control board.

8. Replace the control board.

156 Part Number 000014797 Rev03 03/21

SAFETY LIMIT FEATUREIn addition to the standard safety controls, your Manitowoc ice machine features built-in safety limits that will stop the ice machine if conditions arise which could cause a major component failure.

Safety Limit #1:

If the freeze time reaches 60 minutes, the control board automatically initiates a harvest cycle. 3 cycles outside the time limit = 1 hour Stand-by Mode.

Safety Limit #2:

If the harvest time reaches 3.5 minutes, the control board automatically returns the ice machine to the freeze cycle. 3 cycles outside the time limit = Safety Limit (must be MANUALLY reset).

Safety Limit Stand-by Mode:

The first time a safety limit shut down occurs, the ice machine turns off for 60 minutes (Stand-by Mode). The ice machine will then automatically restart to see if the problem reoccurs.

During the Stand-by Mode the harvest light will be flashing continuously and a safety limit indication can be viewed. If the same safety limit is reached a second time (the problem has reoccurred), the ice machine will initiate a safety limit shut down and remain off until it is manually restarted. During a safety limit shut down the harvest light will be flashing continuously.

Part Number 000014797 Rev03 03/21 157

Determining Which Safety Limit Stopped the Ice Machine: When a safety limit condition causes the ice machine to stop, the harvest light on the control board continually flashes on and off. Use the following procedures to determine which safety limit has stopped the ice machine.

1. Move the toggle switch to OFF.

2. Move the toggle switch back to ON.

3. Watch the harvest light. It will flash one or two times, corresponding to safety limits 1 and 2, to indicate which safety limit stopped the ice machine.

After safety limit indication, the ice machine will restart and run until a safety limit is exceeded again.

Safety Limit Notes

• A continuous run of 100 harvests automatically erases the safety limit code.

• The control board will store and indicate only one safety limit – the last one exceeded.

• If the toggle switch is cycled OFF and then ON prior to reaching the 100-harvest point, the last safety limit exceeded will be indicated.

158 Part Number 000014797 Rev03 03/21

Safety Limit Checklist

The following checklists are designed to assist the service technician in analysis. However, because there are many possible external problems, do not limit your diagnosis to only the items listed.

Safety Limit #1

Freeze time exceeds 60 minutes for 6 consecutive freeze cycles.



page 165

Water System• Water Level too high or defective float (water escaping

water trough)


• High water pressure (80 psig max.)




Part Number 000014797 Rev03 03/21 159

Electrical System• Harvest cycle not initiated electrically

• Contactor not energizing

• Compressor electrically non-operational

• Restricted condenser air flow

• High inlet air temperature (110°F/43.3°C max.)







• Dirty condenser

Refrigeration System• Non-Manitowoc components



• TXV starving or flooding (check bulb mounting)

• Non-condensible in refrigeration system

• Plugged or restricted high side refrigerant lines or component


160 Part Number 000014797 Rev03 03/21

Safety Limit #2

Harvest time exceeds 3.5 minutes for 3 Consecutive harvest cycles.



page 165

Water System• Water area (evaporator) dirty

• Dirty/defective water dump valve


• Water freezing behind evaporator

• Plastic extrusions and gaskets not securely mounted to the evaporator




• Dirty/defective water inlet float


Electrical system• Bin switch defective

• Premature harvest

Refrigeration system• Non-Manitowoc components





Part Number 000014797 Rev03 03/21 161

DIAGNOSING ICE THICKNESS CONTROL CIRCUITRY

Ice Machine Does Not Cycle Into Harvest when Water Contacts the Ice Thickness Control Probe

Step 1 Bypass the freeze time lock-in feature by moving the ON/OFF/WASH switch to OFF and back to ON. Wait until the water starts to flow over the evaporator.

Step 2 Clip the jumper wire to the ice thickness probe and any cabinet ground.

Step 2 Jumper wire connected from probe to groundMonitoring Harvest Light Correction

The harvest light comes on, and 6-10 seconds later, ice machine cycles from freeze to harvest.

The ice thickness control circuitry is functioning properly.

Do not change any parts.The harvest light comes on but

the ice machine stays in the freeze sequence.

The ice control circuitry is functioning properly. The ice

machine is in a six minute freeze time lock-in. Verify

Step 1 of this procedure was followed correctly.

The harvest light does not come on.

Proceed to Step 3.

Step 3 Disconnect the ice thickness probe from the control board terminal. Clip the jumper wire to the terminal on the control board and any cabinet ground. Monitor the harvest light.

Step 3 Jumper wire connected from control board terminal to ground

Monitoring Harvest Light CorrectionThe harvest light comes on, and 6-10 seconds later, ice machine cycles from freeze to harvest.

The ice thickness probe is causing the malfunction.

The harvest light comes on but the ice machine stays in the

freeze sequence.

The control circuitry is functioning properly. The ice

machine is in a six minute freeze time lock-in (verify step 1 of this procedure was followed

correctly).The harvest light does not

energize.The control board is causing the

malfunction.

162 Part Number 000014797 Rev03 03/21

Ice Machine Cycles Into Harvest Before Water Contact with the Ice Thickness Probe

Step 1 Bypass the freeze time lock-in feature by moving the ON/OFF/WASH switch to OFF and back to ON. Wait until the water starts to flow over the evaporator, then monitor the harvest light.

Step 2 Disconnect the ice thickness probe from the control board terminal.

Step 2 Disconnect probe from control board terminal.Monitoring Harvest Light Correction

The harvest light stays off and the ice machine remains in the

freeze sequence.

The ice thickness probe is causing the malfunction. Verify that the Ice Thickness probe is

adjusted correctly.The harvest light comes on,

and 6-10 seconds later, the ice machine cycles from freeze to

harvest.

The control board is causing the malfunction.

Part Number 000014797 Rev03 03/21 163


1. Determine the ice machine operating conditions: Air temperature entering condenser: ____° Air temperature around ice machine: ____° Water temperature entering sump trough: ____°

2. Refer to the appropriate model in the “Cycle Times, 24 Hr. Ice Production and Refrigerant Pressure Charts” on page 219. Use the operating conditions determined in Step 1 to find published 24-Hour Ice Production:_____



164 Part Number 000014797 Rev03 03/21


1. + =Freeze Time



24 Hrs.Total Cycle

TimeCycles per Day


Cycles per Day







Part Number 000014797 Rev03 03/21 165






Manual

166 Part Number 000014797 Rev03 03/21





pressure





Part Number 000014797 Rev03 03/21 167




Water is leaking through the sump trough overflow• Set the water level 1/4”-3/8” below standpipe



Plastic extrusions and gaskets are not secured to the evaporator• Remount/replace as need.

168 Part Number 000014797 Rev03 03/21

UDE0080 Refrigeration DiagnosticsPerform the procedures on the preceding pages before performing refrigeration diagnostics. The first pages cover an overview of the diagnostic procedures followed by diagnostics checklists.

Install thermometer thermocouples on Suction and Discharge line:

• Digital thermometers with remote thermocouples must be used to obtain temperatures.

• Suction and Discharge line thermocouples must be within 3” (76.2 mm) of the compressor.

• Thermocouples must be insulated.

• Doors and all panels must be in place.

• Initial freeze cycle is not used for diagnostics.

• Start monitoring temperatures 3 minutes into the second freeze cycle.

Compare Suction and Discharge temperatures to your model in the charts starting on page 222.

The charts list normal suction and discharge temperatures.

Analysis

Discharge Line Temp

Suction Line Temp

Ice Fill Pattern Refer to Diagnostics

for:Normal Normal Less fill on the

left side of the evaporator

This is normal operation

Low (20°F [-7°C] or more)

Low 20°F (-7°C) or more)


evaporator

Expansion Valve Flooding

Normal orHigh

High 10°F (-12°C) or

more)

Less fill on the left side and top 2 rows of

the evaporator

Low on Refrigerant

or Expansion Valve Starving

Normal Low 5°F (-15°C) or less)


evaporator

Refrigerant Overcharge

Part Number 000014797 Rev03 03/21 169

FLOODING EXPANSION VALVE SYMPTOMSA flooding expansion valve will have discharge and suction line temperatures 20°F (-7°C) lower than normal freeze cycle temperatures. Normal suction line temperature and low discharge line temperature DO NOT verify a flooding valve. Both discharge line temperature and suction line temperature must be low to verify a flooding expansion valve. Ice fill pattern is thin on the left hand side of the evaporator.

STARVING EXPANSION VALVE/LOW REFRIGERANT CHARGE SYMPTOMS:

A. Ice Fill Pattern

• Thin on top two rows of the evaporator

• Thin on entire left side of the evaporator

• Thick on the bottom of the evaporator

B. Freeze time longer than normal

Diagnosis can be confirmed by adding installing a temporary access valve and adding 2 oz (56.7 g) of refrigerant: If the suction line temperature drops or the ice fill pattern on the top two rows fills in, the ice machine is low on refrigerant. Refer to charging procedures for access valve installation/removal procedure.

OVERCHARGED SYSTEM SYMPTOMSSuction line temperature will be slightly low during freeze cycle 5°F (-15°C). Discharge line temperature is normal. Actual amperage readings will be higher than nameplate rating.

170 Part Number 000014797 Rev03 03/21

ANALYZING ICE FORMATION PATTERNEvaporator ice formation pattern analysis is helpful in ice machine diagnostics.


OUTLET

INLET





Part Number 000014797 Rev03 03/21 171



Examples: No ice at all at the outlet of the evaporator, but ice forms at the inlet half of the evaporator. Or, the ice at the outlet of the evaporator reaches the correct thickness, but the inlet of the evaporator already has 1/2” to 1” of ice formation.







No Ice Formation



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ANALYZING DISCHARGE LINE TEMPERATURE 1. Determine the ice machine operating conditions:





Use the operating conditions determined in step 1 to find the published normal discharge temperatures.

Freeze Cycle ______


3. Perform an actual discharge temperature check.




Middle of Cycle __________ __________

End of Cycle __________ __________

4. Compare the actual discharge temperature (Step 3) with the published discharge temperature (Step 2).

The discharge temperature is normal when the actual temperature falls within the published temperature range for the ice machine’s operating conditions. It is normal for the discharge temperature to be lower at the beginning of the freeze cycle, then climb through out the freeze cycle.

Part Number 000014797 Rev03 03/21 173

Discharge Line Temperature High Checklist


page 165











Freeze Cycle Discharge Temperature Low Checklist


page 165






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ANALYZING SUCTION LINE TEMPERATURE The suction line temperature gradually drops throughout the freeze cycle. The actual suction temperature (and drop rate) changes as the air and water temperature entering the ice machine changes. These variables also determine the freeze cycle times. To analyze and identify the proper suction temperature drop throughout the freeze cycle, compare the published suction temperature to the published freeze cycle time.

NOTE: Analyze discharge temperature before analyzing suction temperature. High or low discharge temperature may be causing high or low suction temperature.

1. Determine the ice machine operating conditions:




Use the operating conditions determined in step 1 to find the published normal suction temperatures.

Freeze Cycle ______


2. Perform an actual suction temperature check.



Beginning of Cycle __________ __________Middle of Cycle __________ __________

End of Cycle __________ __________

3. Compare the actual suction temperature (Step 3) with the published suction temperature (Step 2).

The suction temperature is normal when the actual temperature falls within the published temperature range for the ice machine’s operating conditions. It is normal for the suction temperature to be higher at the beginning of the freeze cycle, then drop through out the freeze cycle.

Part Number 000014797 Rev03 03/21 175

Suction Temperature High Checklist


page 165

Discharge Pressure• Discharge temperature is too high, and is affecting

suction temperature, refer to “Discharge Line Temperature High Checklist” on page 173.








176 Part Number 000014797 Rev03 03/21

Suction Temperature Low Checklist


page 165

Discharge Pressure• Discharge temperature is too low, and is affecting

suction temperature, refer to “Freeze Cycle Discharge Temperature Low Checklist” on page 173.








• TXV starving


Part Number 000014797 Rev03 03/21 177

COMPARING EVAPORATOR INLET/OUTLET TEMPERATURESThe temperatures of the suction line entering and leaving the evaporator alone cannot diagnose an ice machine. However, comparing these temperatures during the freeze cycle can help diagnose an ice machine malfunction.










Outlet Temperature


178 Part Number 000014797 Rev03 03/21



• Ambient air temperatures affect the maximum discharge line temperature.

• Higher ambient air temperatures at the condenser equal higher discharge line temperatures at the compressor.

• Lower ambient air temperatures at the condenser equal lower discharge line temperatures at the compressor.

NOTE: Regardless of ambient temperature, the freeze cycle discharge line temperature will be higher than 150°F (66°C) on a normally operating ice machine.


Part Number 000014797 Rev03 03/21 179







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HARVEST VALVE

General


Normal Operation

The valve is de-energized (closed) during the freeze cycle and energized (open) during the harvest cycle. The valve is positioned between the and the evaporator and performs two functions:





Exact temperatures vary according to ambient temperature and ice machine model.

Part Number 000014797 Rev03 03/21 181










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Part Number 000014797 Rev03 03/21 183


line is hot.

Cool & Hot






Hot & Hot






Cool & Cool



184 Part Number 000014797 Rev03 03/21

THIS PAGE INTENTIONALLY LEFT BLANK

Part Number 000014797 Rev03 03/21 185

MAIN FUSE

Function

The control board fuse stops ice machine operation if electrical components fail causing high amp draw.

Specifications

• UDE0080/U0140/UF0140/U0190/UF0190/U0240/UF0240/U0310/UF0310 - 250 Volt, 10 amp.

• UDE0065 - 250 Volt 8 amp

nWarningHigh (line) voltage is applied to the control board at all times. Removing the control board fuse or pressing the power button will not remove the power supplied to the control board.

Check Procedure

1. If the curtain light is on with the ice damper closed, the fuse is good.

nWarningDisconnect electrical power to the entire ice machine before proceeding.

2. Remove the fuse. Check the resistance across the fuse with an ohmmeter.

Reading ResultOpen (OL) Replace fuseClosed (O) Fuse is good

Component Check Procedures

186 Part Number 000014797 Rev03 03/21

BIN SWITCH UDE0080/U0140/UF0140/U0190/UF0190/U0240/UF0240/U0310/UF0310

Function

Bin switch operation is controlled by the movement of the ice damper. The bin switch has two main functions:

1. Terminating the harvest cycle and returning the ice machine to the freeze cycle.

This occurs when the bin switch is opened and closed again within 7 seconds of opening during the harvest cycle.

2. Automatic ice machine shut-off.

If the storage bin is full at the end of a harvest cycle, the sheet of cubes fails to clear the ice damper and holds it down. After the ice damper is held down for 7 seconds, the ice machine shuts off.

The ice machine remains off until enough ice is removed from the storage bin to allow the sheet of cubes to drop clear of the ice damper. As the ice damper swings back to the operating position, the bin switch closes and the ice machine restarts.

Important�The ice damper must be up (bin switch closed) to start ice making.

Part Number 000014797 Rev03 03/21 187

Check Procedure

1. Press the power button to OFF.

2. Watch the curtain light on the control board.

3. Move the ice damper upward, toward the evaporator. The bin switch must close. The curtain light “on” indicates the bin switch has closed properly.

4. Move the ice damper away from the evaporator. The bin switch must open. The curtain light “off” indicates the bin switch has opened properly.

Ohm Test

1. Disconnect the bin switch wires to isolate the bin switch from the control board.

2. Connect an ohmmeter to the disconnected bin switch wires.

3. Cycle the bin switch open and closed numerous times by opening and closing the water curtain.

NOTE: To prevent mis-diagnosis:

• Always use the water curtain magnet to cycle the switch (a larger or smaller magnet will affect switch operation).

• Watch for consistent readings when the bin switch is cycled open and closed (bin switch failure could be erratic).

188 Part Number 000014797 Rev03 03/21

TOUCH PAD U0140/UF0140/U0190/UF0190/U0240/UF0240/U0310/UF0310

Function

User interface to select ice making, delay start or cleaning cycle and provides feedback on ice machine operation.

Check For Normal Operation

Action Normal FunctionPress and hold the control

board test button for 3 secondsAll Touch Pad lights turn on

Press test button All Touch Pad lights turn offPress power button Power light turns on

With power light energized press the delay button 4 times

Cycles through 4 hour delay, 12 hour delay, 24 hour delay

and offPress and hold the power

button for 3 secondsPower light turns off

Press and hold the clean button for 3 seconds

Clean light turns on

Press and hold the clean button for 3 seconds

Clean light turns off

If any switches do not operate correctly, disconnect main power to the ice machine to reset the control board and perform a

second test. If the second test doesn’t show normal function, perform the Ohm test to verify the issue is not a wiring or control

board issue.

Part Number 000014797 Rev03 03/21 189

Ohm Test

Disconnect power from ice machine.

Disconnect wire from control board and Ohm touch pad and interconnecting wire to verify correct operation. Pressing and depressing the touch pad must open and close the circuit. A switch that functions correctly will close as the button is pressed and open as the button is released.

Do not insert electrical probe into end of connector. This will stretch the connector and cause intermittent connection issues. All readings must be taken on the flat exterior of the connector.

Selection WiresOn/Off #2 & #7Delay #3 & #7Clean #4 & #7

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12

Touch electrical probe to these locations only

Do not insert in end of connector

Control Board Connector

190 Part Number 000014797 Rev03 03/21

FLOAT SWITCH U0140/UF0140/U0190/UF0190/UF0240/U0240/U0310/UF0310

Function

Open and close to indicate to the control board the level of water in the water trough.

Specifications

Normally closed, float operated magnetic reed switch.

The float switch contacts are closed in the down position. When water raises the float to the up position the magnet in the float opens the contacts.

Check Procedure

The ice machine uses two float switches.

Ice Thickness Float -Indicates the water level has been reached.

Harvest Float - Indicates a harvest cycle needs to be initiated.

Initial testing can be performed by viewing the control board light(s) while raising and lowering the float. The corresponding control board light must turn on and off when the float is raised and lowered.

Harvest Float switch:

A. The light must be on in the up position.

B. The light must be off in the down position.

,CautionDo not disassemble float for Descaling - Incorrect reassembly of the float will result in an ice machine that will not harvest.

Part Number 000014797 Rev03 03/21 191

Ice Thickness Float Switch:

A. The light must be off in the down position.

B. The light must be on in the up position.

If the control board light does not respond to the float proceed with step 1 below.

1. Disconnect power to the ice machine, pull the wire connector for the float switch through the bulkhead and disconnect.

2. Attach an ohm meter lead to each float switch wire.

3. Place the float in the down position - The float switch must be closed.

4. Place the float in the up position - The float switch must be open.

Float Closed Float Open

NOTE: Make adjustments with the ice machine in the off position. Making adjustments during the freeze cycle may produce an initial sheet of ice that is thicker than future cycles.

Float Float Up Float DownIce Thickness Float OL < 1 Ohm

Harvest Float OL < 1 Ohm

192 Part Number 000014797 Rev03 03/21

WATER TROUGH THERMISTOR U0140/UF0140/U0190/UF0190/U0240/UF0240/U0310/UF0310

Function

Thermistor resistance values change with temperature. The value supplied to the control board is used to identify temperature at the thermistor location.

When the resistance value indicates a temperature of 34°F (1.1°C) the control board will delay the water pump for 25 seconds. When the water pump restarts the water inlet valve will energize for 7 seconds then turn off.

NOTE: If the ice machine is experiencing long freeze cycle shut down, we recommend removing the thermistor and bracket permanently.

Check procedure

THERMISTOR1. Disconnect thermistor from control board and

measure resistance.

2. Measure temperature at the thermistor.

3. Compare measured resistance/temperature readings to resistance/temperature relationship chart.

A. Within 10% of the published resistance value Thermistor is good

B. Not within 10% of the published resistance value - Thermistor is defective.

CONTROL BOARD OPERATION1. Disconnect thermistor from control board - The

control board thermistor LED will flash 1 second on and 1 second off.

2. The control board will default to the 3.75 minute pump delay in the freeze cycle.

Part Number 000014797 Rev03 03/21 193

THERMISTOR CHART

Important�If the ohmmeter reads “OL,” check the scale setting on the meter before assuming the thermistor is bad.

Temperature of Thermistor Resistance

°C °F K Ohms (x1000) -7 - -1.0 19 - 30 47.06 - 34.36

0.0 32 32.650.5 33 31.821.0 33.8 31.031.1 34 30.851.5 34.7 30.252.0 35.6 29.492.5 36.5 28.763.0 37 28.053.5 38 27.36

4.0 - 10.5 39 - 51 26.68 - 19.4311.0 - 15.0 52 - 59 18.97 - 15.7115.5 - 20.0 60 - 68 15.35 - 12.4920.5 - 25.0 69 - 77 12.21 - 10.0025.5 - 30.0 78 - 86 9.78 - 8.0530.5 - 35.0 87 - 95 7.88 - 6.3936.5 - 40.0 98 - 104 6.14 - 5.3240.5 - 46.0 105 - 115 5.22 - 4.20

NOTE: The control board will default to a 3.75 minute pump delay in the freeze cycle, whenever the thermistor is disconnected or reads outside the resistance ranges in the table.

194 Part Number 000014797 Rev03 03/21

BIN THERMOSTAT UDE0065

Function

The bin thermostat stops the ice machine when the bin is full. The level of ice in the ice storage bin controls the ice machine shut-off. When the bin is full, ice cubes contact the bin thermostat bulb holder, which cools down and opens the bin thermostat to stop the ice machine. The ice machine remains off until enough ice has been removed from the bin. This causes the thermostat bulb holder to warm and closes the bin thermostat, restarting the ice machine.

Specifications

Control Setting

Bin Thermostat Cut in: 40°F (4.5°C)Cut out: 34°F (1.0°C)

nWarningDisconnect electrical power to the entire ice machine before proceeding.

1. Remove the back panel to access the bin thermostat.

2. Disconnect both wires from the bin thermostat and check the resistance across the bin thermostat terminals

No Ice On Bulb Ice On Bulb ResultClosed Open Thermostat goodOpen Closed Replace Thermostat

NOTE: After covering/uncovering the bulb holder with ice, wait at least three minutes to allow the thermostat to react. (Open/Close)

Part Number 000014797 Rev03 03/21 195

LIQUID LINE THERMISTOR UDE0065

Function

The liquid line thermistor senses the refrigeration system liquid line temperature. This is used in conjunction with the control board to determine the length of the freeze and harvest cycles.

Specifications

10,000 Ohms +/- 2% at 25°C (77°F)

Check Procedure

Verify that the thermistor resistance is accurate and corresponds to the high and low temperature ranges.

1. Disconnect the thermistor at the control board. Connect an ohmmeter to the isolated thermistor wire leads.

2. Using a temperature meter capable of taking readings on curved copper lines, attach the temperature meter sensing device to the liquid line next to the thermistor.

Important�Do not simply “insert” the sensing device under the insulation. It must be attached to and reading the actual temperature of the copper liquid line.

3. With the ice machine running, verify that the temperature of the discharge line (step 2) corresponds to the thermistor resistance reading (step 1) as stated in the temperature/resistant chart.

Important�If the thermistor would fail closed, the light on the control board will flash rapidly. If the thermistor would fail open, the light on the control board will flash slowly.

196 Part Number 000014797 Rev03 03/21

Temperature/Resistance Chart UDE0065

As the temperature rises at the thermistor block, the resistance drops.

Important�If the ohmmeter reads “OL,” check the scale setting on the meter before assuming the thermistor is bad.

Temperature of Thermistor Resistance

°C °F K Ohms (x1000) 15.6 - 21.1 60 - 70 15.31 - 11.8821.1 - 26.7 70 - 80 11.88 - 9.2926.7 - 32.2 80 - 90 9.29 - 7.3332.2 - 37.8 90 - 100 7.33 - 5.8237.8-43.3 100 - 110 5.82 -4.6643.3 - 48.9 110 - 120 4.66 - 3.7548.9 - 54.5 120 - 130 3.75 - 3.0554.5 - 60.0 130 - 140 3.05 - 2.4960.0 - 65.6 140 - 150 2.49 - 2.0465.6 - 17.1 150 - 160 2.04 - 1.6876.7 - 82.2 170 - 180 1.40 - 1.1782.2 - 87.3 180 - 190 1.17 - 0.9887.8 - 93.3 190 - 200 0.98 - 0.8293.3 - 98.9 200 - 210 0.82 - 0.70

100 212 0.73 - 0.62Boiling water bath104.4 - 110.0 220 - 230 0.59 - 0.51110.0 - 115.6 230 - 240 0.51 - 0.43115.6 - 121.1 240 - 250 0.43 - 0.37121.1 - 126.7 250 - 260 0.37 - 0.33

Part Number 000014797 Rev03 03/21 197

ON/OFF/WASH TOGGLE SWITCH UDE0065/UDE0080

FUNCTION

The switch is used to place the ice machine in ON, OFF or WASH mode of operation.

SPECIFICATIONS

Single-pole, double-throw switch. The switch is connected into a varying low D.C. voltage circuit.

CHECK PROCEDURE

NOTE: Because of a wide variation in D.C. voltage, it is not recommended that a voltmeter be used to check toggle switch operation.

1. Inspect the toggle switch for correct wiring.

2. Isolate the toggle switch by disconnecting all wires from the switch, or by disconnecting the Molex connector from the control board.

3. Check across the toggle switch terminals using a calibrated ohmmeter. Note where the wire numbers are connected to the switch terminals, or refer to the wiring diagram to take proper readings.

198 Part Number 000014797 Rev03 03/21

COMPRESSOR ELECTRICAL DIAGNOSTICSThe compressor does not start or will trip repeatedly on overload.

Check Resistance (Ohm) Values

NOTE: Compressor windings can have very low ohm values. Use a properly calibrated meter.

Perform the resistance test after the compressor cools. The compressor dome should be cool enough to touch (below 120°F/49°C) to ensure that the overload is closed and the resistance readings will be accurate.

Single Phase Compressors

1. Disconnect power from the condensing unit and remove the wires from the compressor terminals.

2. The resistance values between C and S and between C and R, when added together should equal the resistance value between S and R.

3. If the overload is open, there will be a resistance reading between S and R, and open readings between C and S and between C and R. Allow the compressor to cool, then check the readings again.

Check Motor Windings to Ground

Check continuity between all three terminals and the compressor shell or copper refrigeration line. Scrape metal surface to get good contact. If continuity is present, the compressor windings are grounded and the compressor should be replaced.

To determine if the compressor is seized check the amp draw while the compressor is trying to start.

Part Number 000014797 Rev03 03/21 199

Compressor Drawing Locked Rotor

The two likely causes of this are:

• Defective starting component

• Mechanically seized compressor

To determine which you have:

1. Install high and low side gauge.

2. Try to start the compressor.

3. Watch the pressures closely.

• If the pressures do not move, the compressor is seized. Replace the compressor.

• If the pressures move, the compressor is turning slowly and is not seized. Check the capacitors and relay.

Compressor Drawing High Amps

The continuous amperage draw on start-up should not be near the maximum fuse size indicated on the serial tag.

The wiring must be correctly sized to minimize voltage drop at compressor start-up. The voltage when the compressor is trying to start must be within ±10% of the nameplate voltage.

200 Part Number 000014797 Rev03 03/21

FAN CYCLE CONTROL UDE0080/U0140/UF0140/U0190/UF0190/U0240/UF0240/U0310/UF0310

Function

Cycles the fan motor on and off to maintain proper operating discharge pressure.

The fan cycle control closes on an increase, and opens on a decrease in discharge pressure.

Specifications

Model Cut-In (Close) Cut-Out (Open)UDE0080 145 psig ±5 110 psig ±5

U0140 U0190/UF0190 250 psig ±5 200 psig ±5

U0240 U0310 275 psig ±5 225 psig ±5

Check Procedure

Disconnect electrical power to the ice machine at the electrical service disconnect.

Verify fan motor windings are not open or grounded, and fan spins freely.

Connect manifold gauge to ice machine.

Hook voltmeter in parallel across the fan cycle control, leaving wires attached.

Reconnect electrical power to the ice machine and press the power button to ON.

Wait until water flows over the evaporator then refer to chart below.

System Pressure: Reading Should Be: Fan Should Be:Above cut-in 0 volts Running

Below cut-out Line voltage Off

Part Number 000014797 Rev03 03/21 201

HIGH PRESSURE CUTOUT (HPCO) CONTROL UDE0080 U0140/UF0140/U0190/UF0190/U0240/UF0240/U0310/UF0310

Function

Stops the ice machine if subjected to excessive high-side pressure.

The HPCO control is normally closed, and opens on a rise in discharge pressure.

Specifications

Cut-out: 450 psig ±10

Cut-in: Automatic reset

(Must be below 300 psig to reset)

Check Procedure

1. Switch to OFF.

2. Connect manifold gauge.

3. Hook voltmeter in parallel across the HPCO, leaving wires attached.

4. On water-cooled models, close the water service valve to the water condenser inlet. On self-contained air-cooled models, disconnect the fan motor.

5. Set to ON - No water or air flowing through the condenser will cause the HPCO control to open because of excessive pressure. Watch the pressure gauge and record the cut-out pressure.

nWarningIf discharge pressure exceeds 460 psig and the HPCO control does not open, press the power button to stop ice machine operation.

Replace the HPCO control if it:

• Will not reset (below 300 psig)

• Does not open at the specified cut-out point

202 Part Number 000014797 Rev03 03/21

Filter-DriersLiquid Line Filter Drier

The filter-drier used on Manitowoc ice machines are manufactured to Manitowoc specifications.

The difference between a Manitowoc drier and an off-the-shelf drier is in filtration. A Manitowoc drier has dirt-retaining filtration, with fiberglass filters on both the inlet and outlet ends. This is very important because ice machines have a back-flushing action that takes place during every harvest cycle.

A Manitowoc filter-drier has a very high moisture removal capability and a good acid removal capacity.

Important�The liquid line drier is covered as a warranty part. The liquid line drier must be replaced any time the system is opened for repair.

Part Number 000014797 Rev03 03/21 203

Refrigerant Recovery/Evacuation

DEFINITIONS

Recover

To remove refrigerant, in any condition, from a system and store it in an external container, without necessarily testing or processing it in any way.

Recycle

To clean refrigerant for re-use by oil separation and single or multiple passes through devices, such as replaceable core filter-driers, which reduce moisture, acidity and particulate matter. This term usually applies to procedures implemented at the field job site or at a local service shop.

Reclaim

To reprocess refrigerant to new product specifications (see below) by means which may include distillation. A chemical analysis of the refrigerant is required after processing to be sure that product specifications are met. This term usually implies the use of processes and procedures available only at a reprocessing or manufacturing facility.

Chemical analysis is the key requirement in this definition. Regardless of the purity levels reached by a reprocessing method, refrigerant is not considered “reclaimed” unless it has been chemically analyzed and meets ARI Standard 700 (latest edition).

New Product Specifications

This means ARI Standard 700 (latest edition). Chemical analysis is required to assure that this standard is met.

204 Part Number 000014797 Rev03 03/21

REFRIGERANT RE-USE POLICYManitowoc recognizes and supports the need for proper handling, re-use, and disposal of refrigerants. Manitowoc service procedures require recapturing refrigerants, not venting them to the atmosphere.

It is not necessary, in or out of warranty, to reduce or compromise the quality and reliability of your customers’ products to achieve this.

Important�Manitowoc Ice assumes no responsibility for use of contaminated refrigerant. Damage resulting from the use of contaminated, recovered, or recycled refrigerant is the sole responsibility of the servicing company.

Manitowoc approves the use of:

1. New Refrigerant

• Must be of original nameplate type.

2. Reclaimed Refrigerant

• Must be of original nameplate type.

• Must meet ARI Standard 700 (latest edition) specifications.

3. Recovered or Recycled Refrigerant

• Must be recovered or recycled in accordance with current local, state and federal laws.

• Must be recovered from and re-used in the same Manitowoc product. Re-use of recovered or recycled refrigerant from other products is not approved.

Part Number 000014797 Rev03 03/21 205

4. Recovered refrigerant must come from a “contaminant-free” system. To decide whether the system is contaminant free, consider:

• Type(s) of previous failure(s)

• Whether the system was cleaned, evacuated and recharged properly following failure(s)

• Whether the system has been contaminated by this failure

• Compressor motor burnouts and improper past service prevent refrigerant re-use.

• Refer to “” on page 213 to test for contamination.

5. “Substitute” or “Alternative” Refrigerant

• Must use only Manitowoc-approved alternative refrigerants.

• Must follow Manitowoc-published conversion procedures.

206 Part Number 000014797 Rev03 03/21

RECOVERY AND RECHARGING PROCEDURES U0140/UF0140/U0190/UF0190/U0240/UF0240/U0310/UF0310Do not purge refrigerant to the atmosphere. Capture refrigerant using recovery equipment. Follow the manufacturer’s recommendations.

Important�Manitowoc Ice assumes no responsibility for the use of contaminated refrigerant. Damage resulting from the use of contaminated refrigerant is the sole responsibility of the servicing company.

Important�Replace the liquid line drier before evacuating and recharging. Use only a Manitowoc (O.E.M.) liquid line filter drier to prevent voiding the warranty.

CONNECTIONS1. Suction side of the compressor through the suction

service valve.

2. Discharge side of the compressor through the discharge service valve.

Part Number 000014797 Rev03 03/21 207

SELF-CONTAINED RECOVERY/EVACUATION1. Place the power button in the OFF position.

2. Install manifold gauge set, charging cylinder/scale, and recovery unit or two-stage vacuum pump.

3. Open (backseat) the high and low side ice machine service valves, and open high and low side on manifold gauge set.

4. Perform recovery or evacuation:

A. Recovery: Operate the recovery unit as directed by the manufacturer’s instructions.

B. Evacuation prior to recharging: Pull the system down to 500 microns. Then, allow the pump to run for an additional half hour. Turn off the pump and perform a standing vacuum leak check.

NOTE: Check for leaks using an electronic leak detector after charging the ice machine.

Follow the Charging Procedures below.

CHARGING PROCEDURES

Important�The charge is critical on all Manitowoc ice machines. Use a scale or a charging cylinder to ensure the proper charge is installed.

1. Be sure the power button is in the OFF position.

2. Close the vacuum pump valve, the low side service valve, and the low side manifold gauge valve.

3. Open the high side manifold gauge valve, and backseat the high side service valve.

4. Open the charging cylinder and add the proper refrigerant charge (shown on nameplate) through the discharge service valve.

5. Let the system “settle” for 2 to 3 minutes.

6. Press the power button to the on position.

208 Part Number 000014797 Rev03 03/21

7. Close the high side on the manifold gauge set.

NOTE: Manifold gauge set must be removed properly to ensure that no refrigerant contamination or loss occurs.

8. Make sure that all of the vapor in the charging hoses is drawn into the ice machine before disconnecting the charging hoses.

A. Run the ice machine in freeze cycle.

B. Close the high side service valve at the ice machine.

C. Open the low side service valve at the ice machine (when supplied) or disconnect the low loss fitting from the access valve.

D. Open the high and low side valves on the manifold gauge set. Any refrigerant in the lines will be pulled into the low side of the system.

E. Allow the pressures to equalize while the ice machine is in the freeze cycle.

F. Close the low side service valve at the ice machine.

9. Remove the hoses from the ice machine and install the caps.

Part Number 000014797 Rev03 03/21 209

RECOVERY AND RECHARGING PROCEDURES UDE0065/UDE0080Do not purge refrigerant to the atmosphere. Capture refrigerant using recovery equipment. Follow the manufacturer’s recommendations.


Important�Replace the liquid line drier before evacuating and recharging. Use only a Manitowoc (OEM) liquid line filter drier to prevent voiding the warranty.

CONNECTIONSThese ice machines are critically charged. There are no refrigerant access ports on these ice machines.

1. Locate the high and low side process tubes.

2. Install a piercing valve (saddle valve) on both the high and low side process tubes.

Important�• Remove piercing valves after charging.

• Unit is critically charged. Nitrogen must be purged through the system while brazing to prevent build up of copper oxide in the refrigeration system.

• Manifold gauge set must be removed properly to ensure that no refrigerant contamination or loss occurs. A quick disconnect is required for the high side connection.

210 Part Number 000014797 Rev03 03/21

RECOVERY/EVACUATION

1. Place the toggle switch in the OFF position.

2. Install manifold gauge set, charging scale, and recovery unit or two-stage vacuum pump.

3. Open the high and low side valves on manifold gauge set.

4. Perform recovery or evacuation:

A. Recovery: Operate the recovery unit as directed by the manufacturer’s instructions.

B. Evacuation prior to recharging: Pull the system down to 500 microns. Then, allow the pump to run for an additional half hour. Turn off the pump and perform a standing vacuum leak check.

NOTE: Check for leaks using a halide or electronic leak detector after charging the ice machine.

CHARGING PROCEDURES

Important�The charge is critical on all Manitowoc ice machines. Use a scale to ensure the proper charge is installed. A quick disconnect is required for the high side connection

1. Verify the toggle switch is in the OFF position.

2. Close the vacuum pump valve and the low side manifold gauge valve.

3. Open the high side manifold gauge valve.

4. Open the refrigerant cylinder and add the proper refrigerant charge (shown on nameplate) through the discharge service valve.

5. Close the high side on the manifold gauge set. Add any remaining vapor charge through the suction access fitting (if necessary).

Part Number 000014797 Rev03 03/21 211

Let the system “settle” for 2 to 3 minutes.

6. Place the toggle switch in the ICE position.

NOTE: Manifold gauge set must be removed properly to ensure that no refrigerant contamination or loss occurs.

7. Verify that all of the vapor in the charging hoses is drawn into the ice machine before disconnecting the charging hoses.

A. Run the ice machine in the freeze cycle.

B. Verify the refrigerant cylinder valve is closed.

C. Open the high and low side valves on the manifold gauge set. Any refrigerant in the lines will be pulled into the low side of the system.

D. Allow the pressures to equalize while the ice machine is in the freeze cycle.

E. Close the high and low side manifold gauge set and remove from the ice machine.

F. Remove the temporary access fittings

212 Part Number 000014797 Rev03 03/21

System Contamination CleanupThis section describes the basic requirements for restoring contaminated systems to reliable service.


DETERMINING SEVERITY OF CONTAMINATIONSystem contamination is generally caused by either moisture or residue from compressor burnout entering the refrigeration system.

Inspection of the refrigerant usually provides the first indication of system contamination. Obvious moisture or an acrid odor in the refrigerant indicates contamination.

If either condition is found, or if contamination is suspected use a test kit.

If a refrigerant test kit indicates harmful levels of contamination, or if a test kit is not available, inspect the compressor oil.

1. Remove the refrigerant charge from the ice machine.

2. Remove the compressor from the system.

3. Check the odor and appearance of the oil.

4. Inspect open suction and discharge lines at the compressor for burnout deposits.

5. If no signs of contamination are present, perform an acid oil test to determine the type of cleanup required.

Part Number 000014797 Rev03 03/21 213

Contamination/Cleanup ChartSymptoms/Findings Required Cleanup

ProcedureNo symptoms or suspicion of

contaminationNormal evacuation/

recharging procedure

Moisture/Air Contamination symptomsRefrigeration system open to atmosphere

for longer than 15 minutesRefrigeration test kit and/or acid oil test

shows contaminationNo burnout deposits in open compressor

lines

Mild contamination cleanup procedure

Mild Compressor Burnout symptomsOil appears clean but smells acrid

Refrigeration test kit or acid oil test shows harmful acid content

No burnout deposits in open compressor lines

Mild contamination cleanup procedure

Severe Compressor Burnout symptomsOil is discolored, acidic, and smells acrid

Burnout deposits found in the compressor, lines, and other components

Severe contamination

cleanup procedure

214 Part Number 000014797 Rev03 03/21

MILD SYSTEM CONTAMINATION CLEANUP PROCEDURE1. Replace any failed components.

2. If the compressor is good, change the oil.

3. Replace the liquid line drier.

NOTE: If the contamination is from moisture, use heat lamps during evacuation. Position them at the compressor, condenser and evaporator prior to evacuation. Do not position heat lamps too close to plastic components, or they may melt or warp.

4. Follow the normal evacuation procedure, except replace the evacuation step with the following:

A. Pull vacuum to 1000 microns. Break the vacuum with dry nitrogen and sweep the system. Pressurize to a minimum of 5 psig.

B. Pull vacuum to 500 microns. Break the vacuum with dry nitrogen and sweep the system. Pressurize to a minimum of 5 psig.

C. Change the vacuum pump oil.

D. Pull vacuum to 500 microns. Run the vacuum pump for 1/2 hour on self-contained models, 1 hour on remotes.

NOTE: You may perform a pressure test as a preliminary leak check. You should use an electronic leak detector after system charging to be sure there are no leaks.

5. Charge the system with the proper refrigerant to the nameplate charge.

6. Operate the ice machine.

Part Number 000014797 Rev03 03/21 215

SEVERE SYSTEM CONTAMINATION CLEANUP PROCEDURE1. Remove the refrigerant charge.

2. Remove the compressor.

3. If burnout deposits are found, replace the TXV.

4. Wipe away any burnout deposits from suction and discharge lines at compressor.

5. Sweep through the open system with dry nitrogen.

6. Install a new compressor and new start components.

7. Install suction line filter-drier in front of compressor.

8. Install a new liquid line drier.

9. Follow the normal evacuation procedure, except replace the evacuation step with the following:

A. Pull vacuum to 1000 microns. Break the vacuum with dry nitrogen and sweep the system. Pressurize to a minimum of 5 psig.

B. Change the vacuum pump oil.

C. Pull vacuum to 500 microns. Break the vacuum with dry nitrogen and sweep the system. Pressurize to a minimum of 5 psig.

D. Change the vacuum pump oil.

E. Pull vacuum to 500 microns. Run the vacuum pump for 1 additional hour.

216 Part Number 000014797 Rev03 03/21

10. Charge the system with the proper refrigerant to the nameplate charge.

11. Operate the ice machine for one hour. Then, check the pressure drop across the suction line filter-drier.

A. If the pressure drop is less than 2 psig, the filter-drier should be adequate for complete cleanup.

B. If the pressure drop exceeds 2 psig, change the suction line filter-drier and the liquid line drier. Repeat until the pressure drop is acceptable.

12. Operate the ice machine for 48 – 72 hours. Replace the suction line and liquid line drier if necessary.

13. Follow normal evacuation procedures.

Part Number 000014797 Rev03 03/21 217

REPLACING PRESSURE CONTROLS WITHOUT REMOVING REFRIGERANT CHARGEThis procedure reduces repair time and cost. Use it when any of the following components require replacement, and the refrigeration system is operational and leak-free.

• Fan cycle control

• High pressure cut-out control

• High side access valve

• Low side access valve

1. Disconnect power to the ice machine.

2. Follow all manufacturers’ instructions supplied with the pinch-off tool. Position the pinch-off tool around the tubing as far from the pressure control as feasible. (See the figure on next page.) Clamp down on the tubing until the pinch-off is complete.

nWarningDo not unsolder a defective component. Cut it out of the system. Do not remove the pinch-off tool until the new component is securely in place.

3. Cut the tubing of the defective component with a small tubing cutter.

4. Solder the replacement component in place. Allow the solder joint to cool.

5. Remove the pinch-off tool.

6. Re-round the tubing.

NOTE: The pressure controls will operate normally once the tubing is re-rounded. Tubing may not re-round 100%.

218 Part Number 000014797 Rev03 03/21

Total System Refrigerant Charge

Important�This information is for reference only. Refer to the ice machine serial number tag to verify the system charge. Serial plate information overrides information listed on this page.

Model Air-Cooled Water-Cooled Refrigerant Type

UDE0065 5.8 oz (165 g) NA R134A

UDE0080 8 oz (227 g) NA R134A

U0140 10 oz (283 g)

11 oz (312 g) R404A

UF0140 6.7 oz(12g)

11 oz (312 g) R404A

U0190/UF0190 12 oz (340 g) NA R404A

U0240 13 oz (369 g)

12 oz (340 g) R404A

UF0240 13 oz (369 g)

13 oz (369 g) R404A

U0310 Serial Number

310304977 and Earlier

15 oz (425 g)

14 oz (397 g) R404A

U0310 Serial Number

310304978 and After

15 oz (425 g)

18 oz (510g) R404A

UF0310 15 oz(425 g)

18 oz (510g) R404A

Part Number 000014797 Rev03 03/21 219

Cycle Times, 24 Hr. Ice Production and Refrigerant Pressure ChartsThese charts are used as guidelines to verify correct ice machine operation.

Accurate collection of data is essential to obtain the correct diagnosis.

• Production and cycle times are for dice cube - Half dice cube cycle times can be 1-2 minutes faster depending on model and ambient temperature.

• Ice production checks that are within 10% of the chart are considered normal. This is due to variances in water and air temperature. Actual temperatures will seldom match the chart exactly.

• Regular cube production derate is 7%.

• Refer to “Operational Analysis Chart” for the list of data that must be collected for refrigeration diagnostics.

• Zero out manifold gauge set before obtaining pressure readings to avoid mis-diagnosis.

• Discharge and suction pressure are highest at the beginning of the cycle. Suction pressure will drop throughout the cycle. Verify the pressures are within the range indicated.

• Record beginning of freeze cycle suction pressure one minute after the water pump energizes.

• 50Hz dice and half dice production derate is 12%.

• 50Hz regular cube production derate is 14%.

Charts

220 Part Number 000014797 Rev03 03/21

UDE0065 OPERATING TEMPERATURESNOTE: These characteristics will vary depending on operating conditions.Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp. Entering

Condenser °F/°C

Freeze Time Harvest TimeWater Temperature °F/°C

50/10 70/21 90/32

50/10 9.4-12.4 10.7-14.1 11.7-15.5

1.25 - 3.25

70/21 9.6-12.7 11.2-14.8 12.3-16.380/27 10.7-14.1 12.6-16.7 14.0-18.690/32 12.0-15.9 14.0-18.6 15.6-20.9100/38 15.2-20.2 16.6-22.2 18.3-24.5110/43 20.3-27.3 21.1-28.4 22.0-29.5

Times in minutes

24 Hour Ice Production

Air Temp. Entering

Condenser °F/°C

Water Temperature °F/°C50/10Lbs/Kg

70/21Lbs/Kg

90/32Lbs/Kg

50/10 58/26.3 52/23.5 48/21.770/21 57/25.8 50/22.7 46/20.880/27 52/23.5 45/20.4 41/18.690/32 47/21.3 41/18.6 37/16.8100/38 38/17.2 35/15.9 32/14.5110/43 29/13.2 28/12.7 27/12.2

Based on average ice slab weight of .44 – .60 lb (200 - 275 g).

Part Number 000014797 Rev03 03/21 221

UDE0065 Operating Temperatures

Air Temp. Entering

Condenser °F/°C

Freeze Cycle Harvest CycleDischarge

Line Temp °F/°C

Suction Line

Temp °F/°C

Discharge Line

Temp °F/°C

Suction Line

Temp °F/°C50°F10°C

105-12040-50

52-1211- -11

130-14054-60

100-11538-46

70°F21°C

125-15551-68

60- -416- -20

145-15563-68

115-13546-57

80°F27°C

130-16054-71

70-021- -18

155-17068-77

110-14543-63

90°F32°C

150-16566-74

75-524- -15

165-17574-79

125-15051-66

100°F38°C

175-18579-85

85-1029-12

185-19585-91

145-16563-74

110°F43°C

180-19082-88

90-1232- -11

190-20088-93

145-17063-77

222 Part Number 000014797 Rev03 03/21

UDE0080 SELF-CONTAINED AIR-COOLEDNOTE: These characteristics may vary depending on operating conditions.Cycle Times


Air Temp. Entering

Condenser °F/°C


50/10 70/21 90/32

70/21 14.6-16.5 17.6-19.9 20.3-23.0

1.0 - 2.580/27 15.5-17.5 18.9-21.3 22.0-24.990/32 17.6-19.9 22.0-24.9 26.3-29.7100/38 20.3-23.0 23.9-27.1 29.0-32.8

Times in minutes


Air Temp. Entering

Condenser °F/°C

Water Temperature °F/°C50/10 70/21 90/32

70/21 95 80 7080/27 90 75 6590/32 80 65 55100/38 70 60 50

Based on average ice slab weight of 1.0 – 1.3 lb (400 - 600 g).

Operating Temperatures

50°F/10°C Water

Air Temp. Entering

Condenser °F/°C


Line Temp °F/°C

Suction Line

Temp °F/°C

Discharge Line

Temp °F/°C

Suction Line


150-16566-74

67-5019-10

155-19068-88

50-6010-16

70°F21°C

155-18568-85

67-5019-10

160-19071-88

50-6010-16

80°F27°C

170-19078-88

71-5822-14

175-19079-88

52-6511-18

90°F32°C

180-20582-96

75-6524-18

185-21085-99

55-7513-24

100°F38°C

190-21588-102

85-7029-21

195-22091-104

60-7516-24

Part Number 000014797 Rev03 03/21 223

UDE0080 OPERATING TEMPERATURES

70°F/21°C Water

Air Temp. Entering

Condenser °F/°C


Line Temp °F/°C

Suction Line

Temp °F/°C

Discharge Line

Temp °F/°C

Suction Line


155-17568-79

68-5820-14

160-17571-79

50-6010-16

70°F21°C

160-18571-85

70-5021-10

160-19071-85

50-6510-18

80°F27°C

170-20077-93

75-5824-14

170-20077-94

55-7013-21

90°F32°C

180-20582-96

85-6529-18

185-21085-99

55-7513-24

100°F38°C

190-22088-104

88-7031-21

200-22093-104

60-7516-24

90°F/32°C Water

Air Temp. Entering

Condenser °F/°C


Line Temp °F/°C

Suction Line

Temp °F/°C

Discharge Line

Temp °F/°C

Suction Line


155-18068-82

75-5024-10

160-18571-85

52-6511-18

70°F21°C

160-18571-85

75-5324-12

165-19074-88

52-6511-18

80°F27°C

170-19577-91

80-5827-14

175-19579-91

57-7514-24

90°F32°C

190-20588-96

85-6429-18

195-21590-102

55-7513-24

100°F38°C

190-21588-102

91-7033-21

195-22091-104

60-8016-27

224 Part Number 000014797 Rev03 03/21

U0140/UF0140 SELF-CONTAINED AIR-COOLEDNOTE: These characteristics may vary depending on operating conditions.

Cycle Times


Air Temp. Entering

Condenser °F/°C


50/10 70/21 90/32

70/21 10.2-11.7 12.4-14.1 13.0-14.8

1.0-2.580/27 11.2-12.8 13.0-14.8 14.6-16.590/32 11.8-13.4 14.6-16.5 17.6-19.9100/38 14.6-16.5 17.6-19.9 19.9-17.6110/43 16.5-18.7 19.9-17.6 20.3-23.0

Times in minutes


Air Temp. Entering

Condenser °F/°C


70/21 130 110 10580/27 120 105 9590/32 115 95 85100/38 95 85 80110/43 85 80 70

Based on average ice slab weight of 1.06 – 1.19 lb (481 – 540 g). Regular cube derate is 7%

Operating Pressures

Air Temp. Entering

Condenser °F/°C

Freeze Cycle Harvest CycleDischarge Pressure

PSIG

Suction Pressure

PSIG

Discharge Pressure

PSIG

Suction Pressure

PSIG50/10 200-250 55-18 135-170 75-11070/21 200-250 60-20 140-170 75-12080/27 220-265 65-22 145-190 75-12090/32 240-315 70-24 165-200 75-120100/38 300-380 80-30 200-235 75-120110/43 310-400 90-32 210-240 75-120

Suction pressure drops gradually throughout the freeze cycle

Part Number 000014797 Rev03 03/21 225

U0140/UF0140 SELF-CONTAINED WATER-COOLEDNOTE: These characteristics may vary depending on operating conditions.

Cycle Times


Air Temp. Around Ice Machine

°F/°C


50/10 70/21 90/32

70/21 9.8-11.2 11.2-12.8 13.0-14.8

1.0-2.580/27 10.2-11.7 11.8-13.4 13.8-15.690/32 11.8-13.4 13.0-14.8 15.5-17.5100/38 13.0-14.8 15.5-17.5 17.6-19.9110/43 14.6-16.5 17.6-19.9 20.3-23.0

Times in minutes


Air Temp. Around Ice Machine °F/°C


70/21 135 120 10580/27 130 115 10090/32 115 105 90100/38 105 90 80110/43 95 80 70

Based on average ice slab weight of 1.06 - 1.19 lb (481 – 540 g). Regular cube derate is 7% Water regulating valve set to maintain 230 PSIG discharge pressure - Condenser water usage = 185 gallons per 100 lbs of ice at 90°F/70°F.

Operating Pressures


°F/°C


PSIG

Suction Pressure

PSIG

Discharge Pressure

PSIG

Suction Pressure

PSIG50/10 225-235 55-22 135-155 90-11570/21 225-235 65-24 145-160 100-13080/27 225-240 65-24 145-165 100-13090/32 225-245 65-24 145-165 110-130100/38 225-245 70-25 150-175 115-140110/43 225-245 70-26 150-180 115-145


226 Part Number 000014797 Rev03 03/21


Cycle Times


Air Temp. Entering

Condenser °F/°C


50/10 70/21 90/32

70/21 16.1-18.3 19.8-22.5 21.2-24.0

1.0-2.580/27 19.8-22.5 21.9-24.9 24.5-27.890/32 21.9-24.9 23.6-26.8 29.0-32.9100/38 25.5-29.0 29.1-32.9 32.0-36.2110/43 29.1-32.9 32.0-36.2 33.6-38.1

Times in minutes


Air Temp. Entering

Condenser °F/°C


70/21 200 165 15580/27 165 150 13590/32 150 140 115100/38 130 115 105110/43 115 105 100

Based on average ice slab weight of 2.44 - 2.75 lb (1107 – 1247 g). Regular cube derate is 7%

Operating Pressures

Air Temp. Entering

Condenser °F/°C


PSIG

Suction Pressure

PSIG

Discharge Pressure

PSIG

Suction Pressure

PSIG50/10 200-250 60-38 150-170 90-11070/21 200-260 80-38 150-170 95-13080/27 240-290 80-39 160-190 100-13090/32 260-330 80-40 160-190 100-130100/38 310-380 85-41 180-210 105-135110/43 315-390 90-41 180-215 110-135


Part Number 000014797 Rev03 03/21 227


Cycle Times


Air Temp. Entering

Condenser °F/°C


50/10 70/21 90/32

70/21 14.1-16.1 17.0-19.3 18.6-21.1

1.0-2.580/27 15.2-17.4 18.0-20.5 20.5-23.390/32 16.5-18.8 20.5-23.3 22.7-25.8100/38 19.2-21.8 21.9-24.9 23.6-26.8110/43 21.9-24.9 23.6-26.8 24.5-27.8

Times in minutes


Air Temp. Entering

Condenser °F/°C


70/21 225 190 17580/27 210 180 16090/32 195 160 145100/38 170 150 140110/43 150 140 135


Operating Pressures

Air Temp. Entering

Condenser °F/°C


PSIG

Suction Pressure

PSIG

Discharge Pressure

PSIG

Suction Pressure

PSIG50/10 220-275 65-32 145-200 85-11070/21 220-310 75-34 155-210 90-12080/27 270-330 80-36 175-225 90-14090/32 290-350 80-38 185-245 90-150100/38 320-410 85-39 200-260 90-155110/43 355-430 90-40 220-280 90-160


228 Part Number 000014797 Rev03 03/21


Cycle Times



°F/°C


50/10 70/21 90/32

70/21 16.1-18.3 17.0-19.3 18.0-20.5

1.0-2.580/27 16.5-18.8 17.5-19.9 18.6-21.190/32 18.0-20.5 19.2-21.8 20.5-23.3100/38 18.6-21.1 19.8-22.5 21.2-24.0110/43 19.2-21.8 20.5-23.3 21.9-24.9

Times in minutes


Air Temp. Around Ice

Machine °F/°C


70/21 200 190 18080/27 195 185 17590/32 180 170 160100/38 175 165 155110/43 170 160 150

Based on average ice slab weight of 2.44 - 2.75 lb (1107 – 1247 g). Water regulating valve set to maintain 235 PSIG discharge pressure - Condenser water usage = 149 gallons per 100 lbs of ice at 90°F/70°F.

Operating Pressures


°F/°C


PSIG

Suction Pressure

PSIG

Discharge Pressure

PSIG

Suction Pressure

PSIG50/10 230-240 65-30 130-150 80-11070/21 230-240 70-32 135-160 90-12080/27 230-240 70-34 135-160 90-12090/32 230-240 70-36 135-165 90-120100/38 230-245 75-35 135-170 90-120110/43 230-250 80-38 140-175 95-125


Part Number 000014797 Rev03 03/21 229


Cycle Times


Air Temp. Entering

Condenser °F/°C


50/10 70/21 90/32

70/21 10.0-11.5 11.8-13.4 14.1-16.1

1.0-2.580/27 10.4-11.9 12.3-14.0 13.5-15.490/32 11.0-12.6 13.5-15.4 15.2-17.4100/38 12.3-14.0 15.2-17.4 17.5-19.9110/43 15.6-17.8 19.2-21.8 21.2-24.0

Times in minutes


Air Temp. Entering

Condenser °F/°C


70/21 305 265 22580/27 295 255 23590/32 280 235 210100/38 255 210 185110/43 205 170 155


Operating Pressures

Air Temp. Entering

Condenser °F/°C


PSIG

Suction Pressure

PSIG

Discharge Pressure

PSIG

Suction Pressure

PSIG50/10 200-250 45-18 130-150 75-10570/21 200-250 50-18 135-150 75-10580/27 200-270 55-20 140-175 75-11090/32 240-300 60-22 165-185 105-125100/38 275-350 65-23 175-220 130-150110/43 400-320 70-25 210-240 135-155


230 Part Number 000014797 Rev03 03/21


Cycle Times



°F/°C


50/10 70/21 90/32

70/21 11.5-13.2 11.3-12.9 12.0-13.7

1.0-2.580/27 10.0-11.5 11.5-13.2 12.3-14.090/32 10.2-11.7 12.6-14.3 13.1-15.0100/38 10.4-11.9 12.6-14.3 13.5-15.4110/43 10.6-12.2 12.8-14.7 13.8-15.7

Times in minutes


Air Temp. Around Ice

Machine °F/°C


70/21 270 275 26080/27 305 270 25590/32 300 250 240100/38 295 250 235110/43 290 245 230

Based on average ice slab weight of 2.44 - 2.75 lb (1107 – 1247 g). Regular cube derate is 7% Water regulating valve set to maintain 235 PSIG discharge pressure - Condenser water usage = 149 gallons per 100 lbs of ice at 90°F/70°F.

Operating Pressures


°F/°C


PSIG

Suction Pressure

PSIG

Discharge Pressure

PSIG

Suction Pressure

PSIG50/10 230-240 50-24 150-175 75-9070/21 230-240 50-25 150-175 75-9080/27 235-240 50-26 155-175 75-9590/32 235-240 55-27 165-180 80-100100/38 235-250 60-27 165-180 80-100110/43 235-255 60-28 165-180 80-100


Part Number 000014797 Rev03 03/21 231

Wiring DiagramsThe following pages contain electrical wiring diagrams. Be sure you are referring to the correct diagram for the ice machine you are servicing.

nWarningAlways disconnect power before working on electrical circuitry.

Wiring Diagram Legend

The following symbols are used on all of the wiring diagrams:

* Internal Compressor Overload (Some models have external compressor overloads)

** Fan Motor Run Capacitor (Some models do not incorporate fan motor run capacitor)

( ) Wire Number Designation (The number is marked at each end of the wire)

—>>— Multi-pin Connection (Electrical Box Side) —>>— (Compressor Compartment Side)

Diagrams

232 Part Number 000014797 Rev03 03/21

UDE0065 WIRING DIAGRAM

1PH Self Contained Air-cooled

040006021_00

1

2

3

-11

-22

-33

-44

-55

0

(22)

(23)

(24)

(N)

(25)

(26)

(20)

(21)

(3)

(6)

(7)

(8)

(14)

(2)

(1)

(12)

(13)

(4)

(9)

(L1)

GRND

(27)

4

5

7

19

13

56

18

32

49

58

42

17

41

40

34

28

23

14

Part Number 000014797 Rev03 03/21 233

UDE0065 Wiring Diagram 1PH Self Contained Air-cooled

Number Component4 Bin Thermostat5 Compressor7 Compressor Overload

13 Compressor Start Relay14 Condenser Fan Motor17 Contactor Coil18 Contactor Contacts19 Control Board23 Jumper Air cooled or

Drain Pump Safety Switch Water-cooled28 Fuse32 Ice Thickness Control34 Light Harvest40 On/Off/Clean Switch41 See Control Board Schematic For Detail42 Solenoid Valve Harvest49 Thermistor Liquid Line56 Water Inlet Valve58 Water Pump

Refer to control board schematic for control board detail

234 Part Number 000014797 Rev03 03/21

UDE0080 WIRING DIAGRAM

1PH Self Contained Air-cooled

11

10

13R

SC3

000001517_00

(22)

(23) (24)

L2 (N)

(10) (11)

(20)

(21)

(2)

(3)

(6)

(7)

(8)

(5)

(9)(4)

(12)

(13)(15)

(14)

(L1)GRND

3

5712

13

1431

17

25

58

42

17

33

40

34-1

34-2

19 41

Part Number 000014797 Rev03 03/21 235

UDE0080 Wiring Diagram 1PH Self Contained Air-cooled

Number Component3 Bin Switch5 Compressor7 Compressor Overload

12 Compressor Start Capacitor13 Compressor Start Relay14 Condenser Fan Motor17 Contactor Coil18 Contactor Contacts19 Control Board25 Fan Cycle Control28 Fuse31 High Pressure Cutout33 Ice Thickness Probe

34-1 Light Bin Switch34-2 Light Harvest40 On/Off/Clean Switch41 See Control Board Schematic For Detail42 Solenoid Valve Harvest58 Water Pump


236 Part Number 000014797 Rev03 03/21

U0140/U0190/U0240 WIRING DIAGRAM WITH J4 THERMISTOR TERMINAL - 1PH AIR/WATER

Self Contained Air & Water-cooled

L2 (N)

(11)BLU

(10)BLU

(30) BLU

(32) BLU

(31) BLU

(42) WHT

(37) ORG

(2) BLU

(7)BLU

(8)BLU

(30) BLU

(32) BLK

(34) PRPL

(5) PNK

(4) YEL

(6) RED

(3) YEL

(12) PRPL

(13) BRN(15) BRN

(14) BRN

BLU

YEL

RED

WHT

040004017_06

5

12

25

3

42

17

56

5541

19

28

18

7

13

40

14

27

26

58

31

49

Part Number 000014797 Rev03 03/21 237

U0140/U0190/U0240 Wiring Diagram With J4 Thermistor Terminal - 1Ph Air/Water


12 Compressor Start Capacitor13 Compressor Start Relay14 Condenser Fan Motor17 Contactor Coil18 Contactor Contacts19 Control Board25 Fan Cycle Control26 Float Switch - Harvest27 Float Switch-Water Level28 Fuse31 High Pressure Cutout40 On/Off/Clean Switch41 See Control Board Schematic For Detail42 Solenoid Valve49 Thermistor - J455 Water Dump Valve56 Water Inlet Valve58 Water Pump

Wire ColorsBLK BlackBLU BlueBRN BrownPNK PinkPRPL PurpleRED RedWHT WhiteYEL Yellow


238 Part Number 000014797 Rev03 03/21

U0140/U0190/U0240 WIRING DIAGRAM PRIOR TO THERMISTOR TERMINAL - 1PH AIR/WATER


RED

WHT

1

2

3

4

L1

BLU

(14) BRN

(12) PRPL

(15) BRN (13) BRN

3

C

S

10

13R

11

040004017_02

(30) BLU

(32) BLK

(8)BLU

(7) BLU

(32) BLK

(31) BLU

(30) BLU

(10) BLU

(11) BLU

L2 (N)

(42) WHT

(37) ORG

(2) BLU

(4) YEL(3) YEL

(6) RED

(5) PNK

(34) PRPL

GRD

5

12

25

3

42

17

56

5541

19

28

18 713

40

14

27

26

58

31

Part Number 000014797 Rev03 03/21 239

U0140/U0190/U0240 Wiring Diagram Prior to Thermistor Terminal - 1PH Air/Water


12 Compressor Start Capacitor13 Compressor Start Relay14 Condenser Fan Motor17 Contactor Coil18 Contactor Contacts19 Control Board25 Fan Cycle Control26 Float Switch - Harvest27 Float Switch-Water Level28 Fuse31 High Pressure Cutout40 On/Off/Clean Switch41 See Control Board Schematic For Detail42 Solenoid Valve55 Water Dump Valve56 Water Inlet Valve58 Water Pump



240 Part Number 000014797 Rev03 03/21

U0310 WIRING DIAGRAM WITH J4 THERMISTOR TERMINAL - 1PH AIR/WATER


RED

WHT

1

2

3

4

L1

(14) BRN

(12) PRPL

(15) BRN

(48) BLK

C S

R

S

040003315_07

(30) BLU

(32) BLK

(8)BLU

(7) BLU

(32) BLK

(31) BLU

(30) BLU

(10) BLU

(11) BLU

L2 (N)

(42) WHT

(37) ORG

(2) BLU

(4) YEL(3) YEL

(6) RED

(5) PNK

(34) PRPL

GRD

(47) YEL

(49) RED

R

(46) ORG (45) BLU

YEL

BLU

5

11

25

42

17

56

5541

19

28

18 7

9

40

14

27

26

58

31

14

34

3

49

Part Number 000014797 Rev03 03/21 241

U0310 Wiring Diagram With J4 Thermistor Terminal - 1PH Air/Water

Number Component3 Bin Switch5 Compressor7 Compressor Overload9 Compressor PTCR

11 Compressor Run capacitor12 Compressor Start Capacitor14 Condenser Fan Motor17 Contactor Coil18 Contactor Contacts19 Control Board25 Fan Cycle Control26 Float Switch - Harvest27 Float Switch - Water Level28 Fuse31 High Pressure Cutout40 On/Off/Clean Switch41 See Control Board Schematic For Detail42 Solenoid Valve49 Thermistor - J455 Water Dump Valve56 Water Inlet Valve58 Water Pump



242 Part Number 000014797 Rev03 03/21

U0310 WIRING DIAGRAM PRIOR TO THERMISTOR TERMINAL - 1PH AIR/WATER


RED

WH

T

1

2

3

4

L1

(14) BRN

(12) PRPL

(15) BRN

(48) BLK

C S

R

S

040003315 REV05

(30) BLU

(32) BLK

(8)BLU

(7) BLU

(32) BLK

(31) BLU

(30) BLU

(10) BLU

(11) BLU

L2 (N)

(42) WHT

(37) ORG

(2) BLU

(4) YEL(3) YEL

(6) RED

(5) PNK

(34) PRPL

GRD

(47) YEL

(49) RED

R

(46) ORG (45) BLU5

11

25

42

17

56

5541

19

28

18 7

9

40

14

27

26

58

31

14

34

3

Part Number 000014797 Rev03 03/21 243

U0310 Wiring Diagram Prior To Thermistor Terminal - 1PH Air/Water

Number Component3 Bin Switch5 Compressor7 Compressor Overload9 Compressor PTCR

11 Compressor Run capacitor12 Compressor Start Capacitor14 Condenser Fan Motor17 Contactor Coil18 Contactor Contacts19 Control Board25 Fan Cycle Control26 Float Switch - Harvest27 Float Switch - Water Level28 Fuse31 High Pressure Cutout40 On/Off/Clean Switch41 See Control Board Schematic For Detail42 Solenoid Valve55 Water Dump Valve56 Water Inlet Valve58 Water Pump



244 Part Number 000014797 Rev03 03/21

Electronic Control Boards

ELECTRONIC CONTROL BOARD UF MODELS

1 2 3 4 5

67

8

9 10 11 12 13 14 15 16

17

1918

20

21

23

24

25

22

Part Number 000014797 Rev03 03/21 245

Electronic Control Board UF Models

Number Component1 LED Water Pump Relay2 LED Compressor Relay3 LED Water Dump Valve Relay4 LED Harvest Solenoid Valve5 LED Clean6 LED Thermistor7 LED Thermistor8 LED Thermistor9 LED Water Fill Valve

10 LED Harvest Float11 LED Water Level Float12 LED Bin Switch13 LED Safety Limit 214 LED Safety Limit 115 LED Harvest16 LED Test Mode17 Fuse18 Motor Connector 12V - J819 EC Fan Motor Connector 12V - J920 Bin Switch Connector - J521 Float Switch Water Level22 Float Switch Harvest23 Thermistor 2 - J1024 Test Switch25 Thermistor 1 - J4

246 Part Number 000014797 Rev03 03/21

ELECTRONIC CONTROL BOARD U MODELS WITH J4 THERMISTOR TERMINAL

123456

9101112131415

16

17

1918

20

7

8

Part Number 000014797 Rev03 03/21 247

Electronic Control Board U Models With J4 Thermistor Terminal

Number Component1 LED Water Pump Relay2 LED Compressor Relay3 LED Water Dump Valve Relay4 LED Harvest Solenoid Valve5 LED Clean6 LED Thermistor7 JP1 Jumper or Thermistor Connector8 LED Water Fill Valve9 LED Harvest Float

10 LED Water Level Float11 LED Bin Switch12 LED Safety Limit 213 LED Safety Limit 114 LED Harvest15 LED Test Mode16 Fuse17 Bin Switch Connector - J518 Float Switch Water Level19 Float Switch Harvest20 Test Switch

248 Part Number 000014797 Rev03 03/21

ELECTRONIC CONTROL BOARD U MODELS PRIOR TO THERMISTOR TERMINAL

12

34

5

16

910111213

14

15

6

17

78

Part Number 000014797 Rev03 03/21 249

Electronic Control Board U Models Prior To Thermistor Terminal

Number Component1 Water Pump Relay2 Compressor Relay3 Water Dump Valve Relay4 Harvest Solenoid Valve5 Water Inlet Valve Relay6 Fuse7 LED Ice Level Float8 LED Test Mode9 LED Curtain Switch

10 LED Safety Limit 211 LED Safety Limit 112 LED Harvest13 LED Water Level Float14 Test Switch15 Bin Switch Connector J516 Float Switch Water Level17 Float Switch Harvest

250 Part Number 000014797 Rev03 03/21

ELECTRONIC CONTROL BOARD UDE0065

1 2

34

56

Part Number 000014797 Rev03 03/21 251

Electronic Control Board UDE0065

Number Component1 Liquid Line Thermistor2 Ice Thickness Adjustment3 Overflow Jumper Wire4 Harvest Light5 Fuse6 Control Board Transformer

252 Part Number 000014797 Rev03 03/21

ELECTRONIC CONTROL BOARD UDE0080

12

3

4

56

7

8

9

10

Part Number 000014797 Rev03 03/21 253

Electronic Control Board UDE0080

Number Component1 Ice Thickness Probe Connection2 Ice/Off/Clean Toggle Switch Connection3 Bin Switch Light4 Harvest Light5 Control Board Transformer6 Compressor Relay7 Harvest Valve Relay8 Water Pump Relay9 Line Voltage Connector

10 Fuse

254 Part Number 000014797 Rev03 03/21

Tubing Schematics

TUBING SCHEMATIC - UDE0065

EVAPORATORHEAT

EXCHANGER

AIR OR WATER CONDENSER

HARVEST SOLENOID

DRIER

COMPRESSOR

Part Number 000014797 Rev03 03/21 255

TUBING SCHEMATIC - UDE0080/U0140/UF0140

HEAT EXCHANGER


DRIER

RECEIVER (WATER COOLED ONLY)

EXPANSION VALVE

HARVEST SOLENOID

EVAPORATOR

COMPRESSOR

STRAINER

TUBING SCHEMATIC - U0190/UF0190/U0240/UF0240/U0310/UF0310

HEAT EXCHANGER


DRIER

RECEIVER (WATER COOLED ONLY)

EXPANSION VALVE

HARVEST SOLENOID VALVE

EVAPORATOR

COMPRESSOR

STRAINER

256 Part Number 000014797 Rev03 03/21

THIS PAGE INTENTIONALLY LEFT BLANK

MANITOWOC ICE 2110 SOUTH 26TH STREET

MANITOWOC, WI 54220

844-724-2273 WWW.MANITOWOCICE.COM

Part Number 000014797 Rev03 03/21

©2021 Welbilt Inc. except where explicitly stated otherwise. All rights reserved.

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